key oxford discover grammar 4

Student Book 4 Answer Key
Unit 1
Page 4
B
Science Today
Scientists predict the future of space
travel.
Will ordinary people travel into space
in the next five years?
No, they won’t. Trips today cost
thousands of dollars. Ordinary
people won’t have enough money.
But scientists predict space travel
will be cheaper in 20 years. And then
space tourism will grow.
How will tourists travel into space?
I think scientists will build new
spacecraft. They’ll build spaceports,
too. A spaceport is like a station for
trains, or a port for ships!
Will tourists stay in space?
Yes, they will. People will build space
hotels.
C
1 F
2 F
3 T
4 F
5 T
6 T

Page 5
B
1 a
2 b
3 a
4 b
C
1 Will
2 will
3 will
4 Will
5 will
6 won’t
7 Will
8 won’t

Page 6
D
1 My parents will build a house on
the Moon.
2 We will go on vacation in space.
3 My brother will have his own
spacecraft.
4 I won’t stay on Earth.
5 I will fly around the galaxy!

E
1 How will … travel
2 Will … drive
3 Will … go

How will tourists travel in space?
They’ll travel in space planes.
What about robots? Will robots drive
the spacecraft?
Hmm. No, they won’t. I think
astronauts will drive the spacecraft.
Will tourists go on space trips?
Yes, they will. They’ll go on trips to
the moon and Mars.

Page 7
G
1 Will they build a hotel on the
Moon?
2 Will it have a swimming pool?
3 Where will people eat?
4 Will people go on moonwalks?
H
1 will build
2 will travel
3 won’t be
4 will use
5 won’t feel
6 ’ll play
7 ’ll look
8 will be
I
Students’ own answers

Unit 2

Page 8
B
Harry Lee is a space tourist. He’s
going on a three-month space
mission.
Three months is a long time. What
will you do if you miss your family?
If I miss them, I’ll call or email. There
are lots of ways to communicate in
space.
What about food? If you don’t like
the food, will it be a problem?
Yes, it will. If I don’t eat, I’ll be hungry!
But space food is good.
What will happen if you’re sick?
That’s a good question! If I’m sick, I’ll
call a doctor on Earth and I will ask
for advice.
And what about at night? You won’t
enjoy the trip if you can’t sleep.
I’ll count the stars if I can’t sleep.
There are millions of them!

Oxford Discover Grammar  Student Book 4 Answer Key  © Oxford University Press

C
1 d
2 e
3 a
4 b

5 c

Page 9
B
1 c
2 e
3 a
4 b
5 d

Page 10
C
1 don’t … won’t
2 you‘re not … will float
3 you‘re lucky … they‘ll send
4 You‘ll go … work
D
1 do … ’ll stay
2 don’t sleep … ’ll be
3 go … ’ll see
4 feel … will give
E
1 What will you do if you see Mars?
If I see Mars, I’ll take a photo.
2 Will you be frightened if you see
an asteroid?
No, I won’t. I’ll be excited if I see an
asteroid.
F
What will you do if you see Mars?

If I see Mars, I’ll take a photo!
Will you be scared if you see an
asteroid?
No, I won’t. If I see an asteroid, I’ll be
excited!

1


Page 11
H
1 happen
2 don’t
3 will
4 clean
5 break
6 go
7 yes
8 will
9 Will
10 clean
11 Yes
12 will
Hello, Luke. What are you doing?
I’m cleaning the spacecraft. It’s a very
important job in space.
What will happen if you don’t clean
the spacecraft?
Well, the computers will break, if you
don’t clean them.

If the computers break, will we go
back to Earth?
Well, yes, we will.
Will it help if I clean them, too?
Yes, it will. Thank you, Harry.
I
What will you do if you see a
shooting star on the way home?
What will you do if you get some
money for your birthday?
What will you do if you’re bored on
the weekend?
What will you do if you don’t feel
well tomorrow?
Students’ own answers

Module 1 Review
Page 12
A
1 won’t
2 will
3 will
4 won’t
5 won’t
6 will
B
1 will visit
2 Will people travel
3 ’ll fly
4 Will it be

5 won’t be
6 will have
C
1 gets … she‘ll buy
2 she ‘ll look … has
3 won’t … rains
4 visits … she ‘ll learn
5 goes … she ‘ll become
6 she ‘ll discover … she looks

D
1 will explore … have
2 find … will be
3 is … won’t go
4 discover … ‘ll give
5 don’t build … won’t land

C
1 over 2,000 years ago
2 roads
3 Scotland
4 the army
5 the Romans

Page 13

Page 15

E
1 h

2 a
3 d
4 e
5 f
F
1 What will you wear if you go to a
party on Saturday?
2 What will you do if you have an
English test next week?
3 Where will you go if it is sunny this
weekend?
4 What will you do if you finish your
homework early tonight?
G
Students’ own answers

B
1 to live
2 to have
3 to play
4 to take
5 to build
6 to go

Unit 3
Page 14
B
Hadrian’s Wall
The Romans arrived in Britain over
2,000 years ago. When they arrived,

they wanted to travel around the
country. But the roads in Britain
weren’t very good. So, they decided
to build new roads.
The people in Scotland didn’t like
the Romans. They didn’t want them
to control Scotland. So, they had
many battles. About 150 years later,
the Roman Emperor, Hadrian, came
to Britain. He planned to build a high
wall between Roman Britain and
Scotland. Why? Because he needed
to keep the army in Scotland out. He
decided to call it Hadrian’s Wall.
Interesting Facts
Hadrian’s Wall was 117 kilometers
long and three to six meters wide.
At its highest point, the Wall was 3.5
meters high.
There were many forts, towers, and
gates along the Wall. These helped
to stop people leaving.
Today, thousands of visitors go to
Hadrian’s Wall every year and try
to imagine how the Romans lived.

Oxford Discover Grammar  Student Book 4 Answer Key  © Oxford University Press

Page 16
C

1 c
2 a
3 b
4 a
5 c
6 b
D
1 to write
2 to bring
3 to use
What project are you doing, Sara?
Well, I’d like to write about Easter
Island.
Do you have any books about Easter
Island?
Yes, but I forgot to bring them today.
That’s OK. Would you like to use the
computer?
Yes, please.
F
1 to be
2 to travel
3 to discover
4 to stop
5 to find
6 to see

Page 17
G
1 to go

2 to see
3 to make
4 to put
5 to happen
6 to save
7 to preserve
8 to do
H
Students’ own answers

2


Unit 4
Page 18

The Lost City of the Cloud People
One day, a group of villagers were
in the mountains of Peru. They
loved exploring the rainforest and
discovering new things. Suddenly,
they heard a sound like water. There
wasn’t a lake near them. Perhaps
there was a river. They found a path
and started walking along it. They
went a long way, but they didn’t
mind feeling tired. They were curious
about the sound. Suddenly, they
came out of the rainforest and saw
a beautiful place. There was a huge

waterfall, and lots of flowers and
plants. They found ruined buildings,
statues, and rock paintings. It was a
lost city, and it was over 1,000-yearsold. Historians and archeologists
soon came and began exploring
the city. What was this mysterious
place? At last, they finished digging
and examining the ruins. And then
they understood that this was the
home of the Chachapoya tribe.
Chachapoya means “Cloud People”.
Today, people from all over the world
enjoy visiting the lost city of the
Cloud People.
C
Numbers from top down:
2
4
1
6
5
3

Page 19
B
1 ✓
2 ✓
6 ✓
C
1 coming

2 looking
3 drawing
4 playing
5 digging
6 telling

Page 20
D
1 learning
2 reading
3 to be
4 digging up
5 to visit
6 reading

E
1 studying
2 to find
3 traveling
4 to go
5 visiting
F
1 working
2 being
3 to do
4 to find
5 trying
Do you like working as an
archeologist?
Yes, I do. And I love being in Peru.

What are you planning to do next?
I’d like to find the Lost City of
Atlantis.
Is Atlantis a real place?
I don’t know. But I’d enjoy trying to
find it!

Page 21
H
1 to have
2 working
3 building
4 looking
5 having
6 living
7 to live
8 finding
9 to find
10 to solve
I
Students’ own answers

Module 2 Review
Page 22
A
1 to be
2 to travel
3 to work
4 to visit
5 to send

B
1 watching
2 reading
3 looking
4 going
5 coming
C
1 ✓
2 ✗
3 ✓
4 ✗
5 ✗
6 ✓

Oxford Discover Grammar  Student Book 4 Answer Key  © Oxford University Press

D
1 to do
2 shopping
3 eating
4 to go
5 to visit
6 to drive
7 to see

Page 23
E
1 to explore
2 to find
3 enjoyed

4 moving
5 mind
6 began
7 promised
8 going
9 to tell
10 examining
F
Students’s own answers

Unit 5
Page 24
B
Hi! I’m Paul and I’m going on a threemonth chocolate tour in Europe. I’m
starting my adventure in August.
First, I’m travelling by train to an old
town in Spain called Xàbia. There’s
a chocolate festival there and I can’t
wait to try all the different kinds
of chocolate! There’s a chocolate
museum there, too.
In September, I’m flying to Budapest
in Hungary. I’m meeting a friend
there, and we’re going to Budapest’s
Chocolate and Candy Festival. This
festival is famous for chocolate, of
course. It’s also famous for its other
tasty treats, such as vanilla, honey,
and sweet drinks.
Finally, in October, I’m going to a

chocolate festival in Perugia, in Italy.
My friend isn’t coming with me. He’s
going to a cheese festival in France.
I’m not flying to Perugia. I’m driving. I
want to see the beautiful mountains.
The festival in Perugia is one of
the largest chocolate festivals in
Europe. There are chocolate displays,
chocolate tasting days, and even
chocolate sculpting.
C
2 ✓
4 ✓
5 ✓

3


Page 25
B
1 F
2 P
3 F
4 F
5 P
6 P
C
1 a
2 a
3 b

4 b
5 b

Page 26
D
1 Are … having
2 are
3 Are … going
4 aren’t
5 ’re not
6 are … going
7 ’re going
Are we having a school trip this year?
Yes, we are.
Are we going to the science
museum?
No, we aren’t. We’re not going to a
museum this year.
Where are we going?
We’re going to a chocolate factory.
Wow! That sounds good.
E
1 is opening
2 ’re offering
3 ’re having
4 ’m visiting
5 ’re taking
F
2 The bus isn’t leaving at 8:00. It’s
leaving at 8:30.

3 A teacher isn’t giving a tour. A
guide is giving a tour.
4 The aren’t having chocolate for
lunch. They’re having sandwiches
for lunch.
5 The guides aren’t tasting the
chocolate. The children are tasting
the chocolate.

Page 27
G
1 ’re having
2 ’s happening
3 ’s going
4 ’s buying
5 ’m meeting
6 ’re coming
7 ’re making
8 ’m using
9 ’re ordering
10 watching
H
Students’ own answers

Unit 6
Page 28

B
Would you like to see the dessert
menu?

Yes, please. Hmm … I’d like a fruit
salad, please.
Certainly, Sir. Would you like some
ketchup with that?
Er … No, I wouldn’t!
How about some chili powder?
What? No, thank you! Why are you
asking me this?
It’s the latest fashion. It’s called food
combining.
What’s that?
It’s when you put two very different
types of food together.
What kind of foods?
It’s things like strawberries and
pepper, or coffee and salt. Or … and
this is my favorite, ketchup ice cream
with nuts and bananas. Would you
like to try something like that?
No, thank you. I think I’d like the
check, please.
C
1 Would
2 wouldn’t
3 Would
4 would

Page 29
B
1 A

2 T
3 A
4 A
5 T
6 T
C
1 to eat … wouldn’t
2 like … would
3 like to … thank you
4 like … Yes

Oxford Discover Grammar  Student Book 4 Answer Key  © Oxford University Press

Page 30
D
1 d
2 c
3 b
4 a
E
Yes, please. I’m very hungry. ✓
No, I wouldn’t. I don’t like fish. ✓
No, thank you. I prefer strawberry. ✓
Would you like to see the menu?
Yes, please. I’m very hungry.
Would you like to try today’s special?
It’s fish.
No, I wouldn’t. I don’t like fish.
Would you like some chocolate ice
cream?

No, thank you. I prefer strawberry.
F
1 Would you like to try the soup?
2 Would you like some ketchup?
3 Would you like an orange?
4 Would you like to have a piece of
bread?

Page 31
G
1 Would
2 would
3 to
4 thank
5 Yes
6 you
7 don’t
8 Would
9 would
H
Students’ own answers

Module 3 Review
Page 32
A
1 b
2 b
3 c
4 c
5 b

6 a
B
1 ’m going
2 ’re taking
3 ’re visiting
4 ’re finding
5 ’m entering
6 are going
7 ’m traveling
8 ’m starting

4


C
1 Would you like to
2 Would you like
3 Would you like to
4 Would you like

Page 33
D
1 doing
2 going
3 making
4 Would
5 please
E
Students’ own answers

Unit 7
Page 34
B
Graffiti-Knit the City
The next time you’re walking in a
city, you may see something fun! It’s
a new type of street art, or graffiti.
It’s bright and colorful, but you don’t
need paint to do it. You need wool,
and you need to be able to knit.
This new art is called yarnstorming,
and you can do it anywhere. You can
decorate trees, buildings, statues,
cars or anything else with knitting!
Artists put gloves and scarves on
statues and huge covers on phone
booths. In London, somebody
knitted the characters from Alice in
Wonderland to celebrate the new
film. Someone else once hung
huge, knitted hearts from a statue in
Piccadilly Circus.
So, where did yarnstorming begin?
Some people believe it began in a
small town somewhere in the U.S.
It quickly became popular in other
countries. Luckily, yarnstorming isn’t
vandalism, and it isn’t bad for the
environment. That’s because it’s easy
to take the knitting off. The knitters

even tie notes to their work and tell
people to keep the knitting.
C
1 e
2 d
3 f
4 c
5 b
6 a

Page 35
B
1 a ✓
2 b ✓
3 a ✓
4 a ✓

C
1 something
2 Someone
3 anyone
4 someone
5 something
6 anywhere

Page 36
D
1 something
2 anything
3 anywhere

4 somewhere
5 something
E
1 anything
2 something
3 Somewhere
4 something
5 anywhere
6 anyone
Are you doing anything over the
weekend?
Yes! I’m doing something really fun!
I’m going on a trip with my aunt.
Where are you going?
Somewhere in a park.
What does your aunt do?
Well, she’s an artist. She paints, but
she also does green art.
What’s that?
It’s when you make something from
plants or other natural things.
Lucky you! That sounds great. I’m not
going anywhere and I’m not seeing
anyone.
Come with me! You can do some art,
too!
F
1 somewhere
2 anything
3 something

4 somewhere
5 anyone
6 everything

Page 37
G
1 anything
2 anywhere
3 something
4 somewhere
H
1 something
2 anything
3 somewhere
4 anyone
5 anyone
6 someone
I
Students’ own answers

Oxford Discover Grammar  Student Book 4 Answer Key  © Oxford University Press

Unit 8
Page 38
B
Once there was a young artist called
Mia. She wanted to be famous.
One day, she was coming out of
an art gallery with her sketches
when she saw somebody outside. A

woman was painting a building. It
was a very beautiful picture and Mia
stopped to look. Then she realized
the woman was a famous artist
called Camila Blake.
“Ah,” said Camila, when she saw Mia
with her sketches. “You’re an artist,
too.”
“But I’m not brilliant like you,” Mia
replied. “People don’t want my
paintings.”
“Show me your work,” said Camila.
“I’ll give you an art lesson.”
So, Mia began painting. Camila gave
her advice and helped her with her
work. After a while, a man stopped
by Mia’s painting. “I’d like to buy that
for my wife,” he said.
“Shall I bring it to your house later?”
Mia offered. She was happy. It was
her first sale.
“Thank you,” said the man. And he
gave Mia his address.
Mia began a new painting, and soon,
more people came. They looked
at her paintings and her sketches,
and they wanted to buy them all. At
the end of the day, there were no
more of Mia’s pictures. “Now you’re a
successful artist!” said Camila. “Come

on. Let’s celebrate! I’ll buy you some
cake.”
C
1 C
2 C
3 M
4 M
5 C

Page 39
B
1 b
2 c
3 d
4 a
C
1 d
2 c
3 b
4 a

5


Page 40
D
1 Shall
2 Shall
3 ’ll
E

1 Shall
2 ’ll
3 ’ll
4 Shall
I don’t have any paints.
Shall I buy you some when I go to
the store?
Yes, please.
My computer’s not working.
I’ll lend you my laptop.
Thanks, Dad.
I can’t find a good picture of the
Mona Lisa.
I’ll find something for you.
Thanks, Josh.
I’m doing a sketch, but I can’t get the
smile right.
Shall I help you?
No, thanks, Katie. Practice makes
perfect.
G
1 Shall … get
2 ’ll draw
3 Shall … paint
4 ’ll get

Page 41
H
1 Shall … mix
2 ’ll mix

3 ’ll make
4 Shall … get
5 ’ll take
I
Students’ own answers

Module 4 Review
Page 42
A
1 c
2 a
3 b
4 a
5 c
B
1 anywhere
2 somewhere
3 anyone
4 anything
5 something
6 anything
7 something
8 anyone

C
1 Shall
2 ’ll
3 ’ll
4 Shall

Page 43
D
1 somewhere
2 Shall
3 anyone
4 anything
5 ’ll
E
1 I’m bored.I’ll go to the park
with you.
2 I’m tired.
I’ll clean the car.
3 I can’t find
my pen.
I’ll lend you mine.
4 I can’t do my
homework.
I’ll help you.

Unit 9
Page 44
B
If you go to Bodie, in California,
you will see a ghost town. There
are houses, but nobody lives there,
and everything is broken and old.
There are stores, but they are empty,
and no one works inside. If you
explore the buildings, you’ll see mice
everywhere. You’ll see snakes and

lizards, too. And if you go outside,
you may see a mountain lion or a
bear. But there are no people in the
town. So, where did they go?
In the 1870s, a man discovered gold
in the Sierra Nevada. Everybody
heard about the gold, and many
people came to find it. They built
gold mines, and then they built a
town. They called the town Bodie,
and they lived there and looked for
gold. But by the 1940s, there was
nothing left in the mines. The gold
was gone, and everybody went.
Today, Bodie is an historical place
and a tourist attraction. It’s closed
in the winter because of the terrible
wind and snow. But in the summer,
thousands of visitors come. They try
to imagine what life was like in the
Wild West all those years ago.
C
1 nobody
2 Everything
3 No one
4 everywhere
5 Everybody
6 nothing

Oxford Discover Grammar  Student Book 4 Answer Key  © Oxford University Press

Page 45
B
1 ✓
2 ✓
5 ✓
C
1 no one
2 nobody
3 nothing
4 nowhere
5 no one
6 Everything

Page 46
D
1 a
2 b
3 a
4 c
5 b
E
1 nothing
2 No one
3 Everyone
4 Everyone
5 Everything
6 No one
F
What’s your town like?

It’s boring. There’s nothing to do!
What about the cafe?
It’s boring. No one goes there!
What about your friends? What do
they think?
Everyone thinks it’s boring. What’s
your town like?
I like it! Everyone is friendly.
Everything is fun! No one is bored!
H
There are ghost towns everywhere!
They’re all around the world. Craco
is a beautiful, medieval village in the
south of Italy. Once it was a busy
and successful town. Everything
was happy there. No one wanted to
leave! But then, in 1963, everywhere
suddenly moved to a different
town! They took everything they
had, and they didn’t go back. What
happened? Why did they leave?
They left because there were many
earthquakes and landslides. The
village became too dangerous to live
in.

6


Page 47

I
1 somewhere
2 nothing
3 no one
4 Everywhere
5 everything
6 nowhere
7 Everyone
8 nothing
J
Students’ own answers

Unit 10
Page 48
B
Jack’s school was closed for the day.
“I’m very busy at work today,” said
Jack’s mom to his dad. “He can go to
work with you, can’t he?”
Jack’s dad was a town planner, and
he had an important meeting that
day. But he said, “OK.” Then he asked
Jack, “You will be good, won’t you?”
“Yes, I will,” said Jack. “I’m always
good!”
“And you won’t talk in the meeting,
will you?”
“No, I won’t.” He smiled.
A driver drove them to the office in
a long, black car. Jack looked out the

window. The town looked gray.
“This town is ugly, isn’t it?” said Jack.
“Yes, it is,” said Jack’s dad, but he
wasn’t really listening.
“People don’t like it, do they?”
Jack’s dad didn’t look up.
At the meeting, people were talking
about the plans for a new town.
“We’re building houses, hospitals,
stores, and offices,” said a woman.
“It’ll be just like this town,” said Jack’s
dad. And he was happy with that.
“No!” said Jack. “Nobody likes this
town. Build a new and colorful town!
Paint the houses blue and red. Plant
flowers! You can do it, can’t you?”
“Yes, we can!” said everyone in
the room. Even Jack’s dad looked
excited.
And so they built a new town. They
painted the houses blue and red,
and they built a beautiful park, and a
movie theater. They called the movie
theater “Jack’s theater’’, and painted it
purple and green.

C
1 d
2 f
3 a

4 c
5 e
6 b

Page 49
B
1 a
2 a
3 b
4 b
5 a
6 b

Page 50
C
1 b
2 d
3 e
4 c
5 f
6 a
D
1 Yes, I am
2 Yes, it is
3 No, they don’t
E
You’re from Brasilia, aren’t you?
Yes, I am.
That’s the capital of Brazil, isn’t it?
Yes, it is.

They don’t speak Spanish there, do
they?
No, they don’t. They speak
Portuguese.
G
1 isn’t he
2 aren’t we
3 is it
4 will it
5 don’t you
6 don’t we

Module 5 Review
Page 52
A
1 everyone
2 nothing
3 Everywhere
4 nobody
5 Everybody
B
1 no one
2 no one
3 no one
4 everywhere
5 everyone
C
1 aren’t you
2 isn’t it
3 hasn’t he

4 will you
5 do you
6 won’t you

Page 53
D
1 aren’t
2 Everyone
3 didn’t
4 somewhere
5 Everywhere
E
1 isn’t it
2 aren’t you
3 aren’t you
F
Students’ own answers

Page 51
H
1 aren’t you
2 do you
3 didn’t you
4 isn’t it
5 didn’t they
I
1 You like being a town planner,
don’t you?
2 Brasilia has a lot of tall buildings,
doesn’t it?

3 You don’t like old towns, do you?
4 They speak Portuguese in Brazil,
don’t they?
J–K
Students’ own answers

Oxford Discover Grammar  Student Book 4 Answer Key  © Oxford University Press

7


Unit 11
Page 54
B
Great Discoveries
Some great things happen by
accident. This is the story of
penicillin.
Alexander Fleming was Scottish. He
was a scientist in the early twentieth
century. At that time, he was
working hard on different ideas. He
was studying bacteria because he
knew it was dangerous for humans.
He wanted to find a way to destroy it.
So he grew bacteria in small, round
glass dishes called “petri dishes”. He
did experiments and tried to find an
answer. But he wasn’t successful. He
didn’t know what to do.

Like all scientists, Fleming wore a
long, white lab coat and he worked
in a laboratory full of equipment. But
Fleming wasn’t the cleanest scientist
in the world. One day, when he left
to go on vacation, he didn’t clean
his petri dishes. When he came back,
he noticed some interesting, green
mold growing on one of his dishes.
He studied it through his powerful,
silver microscope and saw that the
mold was killing the bacteria. He was
amazed. He knew he could use the
mold to fight bacteria in humans.
Years later, his ideas were successful.
Today, penicillin saves millions of
lives.
C
1 small, round
2 long, white
3 interesting, green
4 powerful, silver

Page 55
B
Opinion: beautiful fantasticugly
Size:large big small
Age:
old
modernnew

Shape: triangularsquare round
Color: red
yellowblue
Material:wooden cotton glass
C
Students’ own answers
D
1 b
2 b

Page 56
E
1 huge, modern
2 large, round, glass
3 great, new
4 fantastic, black and white
5 ugly, green
F
Helen They’re building a big, new
science laboratory at our
school. A scientist from
Denmark is coming to open
it.
Mom That sounds good.
Helen But I’ve only got an old, gray,
cotton lab coat. Can I have a
new one?
Mom Yes, of course.
Helen And can I have a silver, new
microscope for my birthday?

Mom All right, Helen.
Helen Thanks, Mom. I want to be
a famous scientist one day.
I want to discover a new,
fantastic idea.
G
1 little, old, gray
2 beautiful, green
3 tiny, brown
4 huge, old, black
H
Where did you live when you were a
child?
We lived in a little, old, gray house
in the countryside. I loved exploring
the beautiful, green fields and
finding out things.
Were you always interested in
science?
Yes, I was. I did experiments in a tiny,
brown shed in our garden.
Did you have a lab coat?
Well, no, I didn’t. But I had a huge,
old, black coat. It was my father’s and
I loved it!

Page 57
J
1 They’ve got great, new science
books.

2 She’s got a lovely, white lab coat.
3 It’s a fantastic, large, modern
building.
4 He’s an interesting, young
scientist.
K
1 long, rectangular, wooden
2 smart, green, cotton
3 small, white, plastic
4 amazing, silver
5 big, black and white
6 fantastic, new

Oxford Discover Grammar  Student Book 4 Answer Key  © Oxford University Press

L
Students’ own answers

Unit 12
Page 58
B
Did you use to eat your vegetables?
When you were small, did your
parents use to say, “Eat your
vegetables, or you won’t grow!”? Did
you use to listen to them? Or did you
use to hide your vegetables under
your plate? Today we may not always
like our carrots and our peas, but we
know they’re good for us and make

us healthy. But many years ago,
people didn’t use to know that there
were vitamins and minerals in their
food. They often became sick, and
they didn’t know why.
One of the first people to think about
food and health was a man called Dr.
James Lind. He became a doctor on
a ship in 1747. At that time, sailors
used to go on long sea voyages, and
they often caught a disease called
scurvy. In those days, they didn’t use
to have refrigerators. So, they used
to eat a lot of dried meat and bread,
but no fruit or vegetables. Dr. Lind
thought that the sailors’ diet was
the reason for scurvy. He started to
experiment. He decided to give the
sailors some fruit to eat. He gave
them limes and they recovered from
their sickness. Two hundred years
later, scientists discovered that limes
are full of Vitamin C, which keeps us
healthy. Dr. Lind’s experiment was
the beginning of our understanding
of how food can make us healthy.
C
1 T
2 T
3 T

4 F
5 T
6 F

Page 59
B
1 a
2 a
3 b
4 a
C
1 use to
2 used to
3 didn’t use to
4 used to
5 use to

8


Page 60
D
Students’ own answers
E
1 use to
2 No, I didn’t.
3 use to
4 Yes, I did.
5 use to
6 No, I didn’t.

7 Did you use to
8 Yes, I did.
F
2 Did you use to swim in the sea?
3 Did you use to eat a lot of
chocolate?
4 Did you use to like bananas?

Page 61
G
1 use to be
2 use to do
3 use to eat
4 used to play
5 used to ride
6 didn’t use to like
7 didn’t use to get up
8 used to be
H
1 She didn’t use to watch TV. She
watches TV now.
2 She didn’t use to ride a bike. She
rides a bike now.
3 She didn’t use to love ice cream.
She loves ice cream now.
4 She used to go to bed early. She
doesn’t go to bed early now.
5 She used to have a lot of colds.
She doesn’t have colds now.
I

Students’ own answers

Module 6 Review
Page 62
A
1 ✓
2 ✗He wants to wear a nice, green,
cotton coat.
3 ✓
4 ✓
5 ✗He likes growing ugly, yellow
mold in petri dishes
B
1 interesting, green
2 fantastic, tiny, silver
3 large, green, plastic
4 fascinating, new
5 large, pink, cotton

C
1 use to like
2 used to have
3 use to enjoy
4 didn’t use to like
5 used to love
6 used to have
7 use to learn
8 used to learn

Page 63

D
1 d
2 b
3 g
4 h
5 f
6 c
E
Students’ own answers

Unit 13
Page 64
B
I’m talking to Ana and Lucy. They run
a school magazine called Chatter.
Tell me, was it difficult to start a
magazine?
Yes, it was. We had to work hard. But
now the magazine is popular, and it’s
really fun!
Lots of young people would like to
start a school magazine. Do you have
any advice?
First, you must talk to the teachers at
your school.
That’s right. You mustn’t start before
your school gives you permission.
What happens after that?
You should find an editor, writers,
and photographers.

The editor has the most important
job.
What does the editor do?
He or she has to make all the
decisions and decide what to
include.
Then you can think about cost and
design. You need to think about the
cover, the number of pages, and the
kind of articles you want.
And the title is important. It doesn’t
have to be really original, but it has
to be interesting! Short titles are
usually best.
And then you can start work?
Yes! Do interviews, write stories, take
photos, and create the magazine.
When you’re happy with it, print lots
of copies, and sell them!

Oxford Discover Grammar  Student Book 4 Answer Key  © Oxford University Press

C
1 ✓
2 ✗
3 ✓
4 ✗
5 ✓
6 ✗

Page 65
B
2 ✓
6 ✓
C
1 mustn’t
2 must
3 must
4 don’t have to
5 have to

Page 66
D
1 b
2 a
3 c
4 a
5 b
6 b
E
1 have
2 must
3 must
4 mustn’t
5 don’t have
F
We have to print the next magazine
tomorrow.
But we need one more story.
I know. You must do an interview

tomorrow.
Who with?
Johnny Step has a new film. He’ll be
at the theatre. You must go there.
Will you come with me?
I’m sorry, I can’t! I mustn’t leave my
computer. I’ve got a lot to do.
You don’t have to work on the
computer all day!
Yes, I do. And we need that story!
All right. I’ll do it!
H
1 has to do
2 must write
3 has to do
4 has to look
5 must think
6 doesn’t have to take

9


Page 67
I
1 have
2 have to
3 must
4 don’t
5 mustn’t
J

Excuse me, Johnny. My name’s Hugo.
Can I ask you some questions?
No, I’m sorry. I have to be at the
theater in ten minutes and I have to
meet some reporters before that.
Please, Johnny! It’s for our school
magazine. We must have a good
story for tomorrow! You don’t have
to stay long.
All right. You can ask me three
questions. But you can’t ask me more
than that. I mustn’t be late for the
show!
L
1 have to
2 don’t have to
3 have to
4 must / have to
5 mustn’t
M
Students’ own answers

Unit 14
Page 68
B
Have you seen this monkey?
A monkey called Sabrina has
escaped from Fleetside Zoo. The
zoo has informed the emergency
services, and they have started a

search for Sabrina. They are looking
in local parks and gardens.
Fleetside Zoo has been open for
25 years, and thousands of visitors
go there every year. There is a large
monkey enclosure at the zoo, and
Sabrina is a very popular monkey
there. She is ten-years-old and has
been at Fleetside for eight years.
Everyone wants to see Sabrina back
at the zoo.
“We’re all very worried,” said one
keeper at the zoo. “This is the first
time we have lost an animal. Sabrina
is a lovely monkey. She eats a lot and
sleeps a lot. I don’t think she will hurt
anyone.”
“We have spoken to a number of
people,” said one police officer.
“But they haven’t seen her. We
think Sabrina has gone to the park.
Monkeys like trees and open spaces.”
If you have seen a monkey, please
contact the zoo.
C
Numbers from top down:
2
4
1
5

3

Page 70
B
1 started
2 been
3 been
4 given
5 escaped
6 found
C
1 ✗
2 ✓
3 ✓
4 ✓
5 ✗
6 ✓

Oxford Discover Grammar  Student Book 4 Answer Key  © Oxford University Press

D
Nero’s keeper I’ve looked after Nero
for ten years. I’ve worked with other
animals too, but lions are my favorite.
I love Nero. He sleeps all the time
because he’s very old and tired. He’s
gentle, too. I haven’t see him angry
before. He hasn’t hurt anyone before.
This is the first time he has escape.
E

1 been
2 seen
3 eaten
4 bought
5 taken
6 escaped

Page 71
F
1 haven’t lost
2 haven’t worked
3 haven’t seen
4 have seen
5 haven’t found
6 has looked
G
1 has returned
2 haven’t seen
3 haven’t worked
4 hasn’t done
5 hasn’t had
6 has been
H–I
Students’ own answers

Module 7 Review
Page 72
A
1 a
2 b

3 c
4 c
5 a
6 b
B
1 must
2 mustn’t
3 don’t have to
4 don’t have to
5 must
C
1 has become
2 have started
3 haven’t done
4 has opened
5 hasn’t eaten
6 has given

10


D
1 have done
2 have been
3 have swum
4 have become
5 haven’t written
6 I have done
7 have worked
8 haven’t been

Page 73
E
1 climbed
2 has
3 have
4 done
5 haven’t
6 have
7 must
8 don’t
9 mustn’t
10 begun
F
Students’ own answers

Unit 15

Page 76

Page 74
B
Community paramedics live in the
local area. They get to accidents
first and look after patients until the
ambulance arrives. We interviewed
Lucy Reynolds about her job as a
community paramedic.
Have you trained as a nurse or a
doctor?

No, I haven’t. Community paramedics
aren’t trained like that.
Have you learned first-aid?
Yes, I have. I carry first-aid equipment
with me. I’ve taken a training course,
too.
Have you ever driven an ambulance?
No, I haven’t. I’ve never driven an
ambulance. My brother, John, is an
ambulance driver so of course he
drives an ambulance.
Has he been at the same emergency
as you before?
No, he hasn’t. He works in a different
town.
So, what do you do when you arrive
at the scene?
Well, we talk to the patient. We find
out what happened. We ask them
questions about their health and we
give them first-aid.
Have you ever worked in a disaster
zone in a different country?
No, I haven’t. I’ve never done
that, but I’d like to try that in the
future. I’d like to help people in
other countries. I’d like to make a
difference.
Two questions use ever.
C

1 d
2 c
3 a
4 e
5 b

Page 75
B
1 c
2 a
3 d
4 b
C
1 AHave … been
2 A Has … arrived
3 A Have … received

B have
B hasn’t
B have

Oxford Discover Grammar  Student Book 4 Answer Key  © Oxford University Press

D
1 Have you seen
2 Have you heard
3 Has the storm arrived
4 Have the people left
5 Has the reporter told
F

1 ever
2 never
3 ever
4 never
G
Have you ever been in a natural
disaster?
No, I haven’t. I’ve never been near
anything like that. But my brother,
Jim, is a news reporter. He’s been to
lots of places.
Has he ever been in an earthquake?
He’s never been in an earthquake,
but he’s been close to a tornado. That
was scary.

Page 77
I
1 Have you ever seen a tornado?
No, I’ve never seen a tornado.
2 Has Jim ever been in an
earthquake? No, he’s never been
in an earthquake.
J
1 Have you ever been
2 Have you ever seen
3 Have you ever helped
4 ’ve taken
5 Have you ever saved
6 ’ve never done

K
Have you ever been in an
earthquake?
No, I haven’t.
Have you ever seen a hurricane?
Yes, I have. It was in the Caribbean.
Have you ever helped people in a
disaster zone?
Yes, I have. I’m a news reporter, but
I’ve taken a first-aid course.
Have you ever saved someone’s life?
No, I haven’t. I’ve never done that,
but I’ve helped doctors and nurses.
They do a fantastic job.
M
Have you ever climbed a volcano?
Have you ever seen a tornado?
Have you ever been in a
thunderstorm?
Have you ever been in an
earthquake?
Have you ever given first aid?
Have you ever met a reporter?

11


N
Students’ own answers

Unit 16
Page 78

B
Hi, Nada! How are you?
I’m OK, but have you heard about
the tornado in Florida?
No, I haven’t. I’ve just got home from
school. I haven’t turned on the TV
yet. Why?
The National Weather Service has
just issued a tornado watch.
What does that mean?
It means there might be a tornado.
The weather conditions are right.
Have you prepared the house yet?
We haven’t bought any extra food
yet. Mom and Dad have already
closed the shutters on the windows.
And I’ve just put some new batteries
in my flashlight. We’ve had tornados
here before, so we know what to do.
It sounds scary.
It’s OK. What’s the weather like in
England?
It’s sunny.
Lucky you! Well, I’ll call you tomorrow
and let you know what happened.
OK. Good luck!
C

1 yet
2 already
3 yet
4 just

Page 79
B
1 ✗
2 ✓
3 ✗
4 ✓
5 ✓
6 ✗
C
1 just
2 yet
3 yet
4 yet
5 just
6 just

Page 80
D
1 yet
2 already
3 yet
4 just
5 just
Have you turned on the TV yet?
There’s a program about hurricanes

in Jamaica.
Oh, that program’s been on before.
I’ve already seen it three times.
Well, I haven’t seen it yet. My friend,
Grace, is visiting her aunt in Jamaica,
so I’d like to watch it.
OK. I’ll watch it again. Where’s Joe?
He’s interested in extreme weather.
I think he’s just come in. I’ve just
heard someone go upstairs.
E
1 just
2 yet
3 already
4 yet
5 yet
F
1 I’ve just spoken to Grace.
2 Has she arrived in Jamaica yet?
3 Yes, she’s already been there for
three hours.
4 Has she arrived at her aunt’s house
yet?
5 No, she hasn’t left the airport yet.

Page 81
G
1 Has Grace arrived at her aunt’s
house yet?
2 She’s just had her dinner.

3 She hasn’t emailed Kate yet.
4 She’s already heard about the
hurricane.
H
1 ’ve just come
2 ’ve already eaten
3 haven’t had a hurricane yet
4 ’s already bought
5 have already left
6 has already ended
7 haven’t stopped yet
8 have just finished
I
Students’ own answers

Oxford Discover Grammar  Student Book 4 Answer Key  © Oxford University Press

Module 8 Review
Page 82
A
1 c
2 b
3 a
4 b
5 a
6 c
B
1 e
2 b
3 f

4 c
5 a
6 d
C
1 I haven’t seen the news yet.
2 Has the storm started yet?
3 The rain has just begun.
4 We haven’t heard the thunder yet.
5 My brother has already lost his
umbrella.
6 I’ve just seen lightning.

Page 83
D
1 Have you heard
2 haven’t seen
3 Has it started yet
4 ’ve just seen
5 ’ve never made
6 haven’t done
7 ’ve already done
8 haven’t eaten yet
E
1 never
2 yet
3 hasn’t
4 ever
5 have
F
1 Have you ever seen snow?

2 Have you ever run in the rain?
3 Have you ever heard thunder?
4 Have you ever been in a
hurricane?
5 Have you ever seen a tornado?
Students’ own answers

12


Unit 17
Page 84
B
Earlier, Sam interviewed tree expert,
Scott Hill, to find out about the
amazing Giant Redwood trees in
California.
How long have you been interested
in trees?
Well, I’ve been interested in trees
since I was a child. We lived near a
forest when I was a little boy. I loved
climbing trees and finding out about
them.
How long have you lived in
California?
I’ve lived here for a year. I’ve been
interested in the Giant Redwoods
since I arrived.
What is special about them?

They’re the tallest trees in the world
and can grow to more than 100
meters.
How long do they live?
They usually live between 500 and
700 years, but they can live for up
to 2,000 years. They are very strong,
so fire, disease, and insects don’t kill
them.
Are they protected under the law?
Yes. It’s been illegal to damage the
trees for almost 100 years. That’s
because people cut thousands of
them down for their wood.
C
1 child
2 year
3 Giant Redwoods
4 100 years

Page 85
B
1 ✓
2 ✗
3 ✓
4 ✓
5 ✗
6 ✗
C
1 since

2 for
3 since
4 for
5 for

Page 86
D
I’m Henry. I’ve lived in California since
I was a baby. I’m twenty-two now. I
haven’t known Scott since long. But
he’s been my friend for he arrived.
We both like trees! I’ve wanted to
go to the Amazon rainforest for a
long time. I’m really interested in the
Kapok Tree there. I’m going to the
Amazon rainforest on July 30th. I’ll
tell you all about it!
E
1 Henry has been in Brazil for five
days.
2 He’s been in the Amazon rainforest
since Tuesday.
3 He’s seen lots of animals since he
arrived.
4 He hasn’t studied any trees since
he got there.
G
1 How long have you been a
rainforest guide?
2 How long has your family lived in

the rainforest?
How long have you been a rainforest
guide?
I’ve been a guide for many years.
How long has your family lived in the
rainforest?
My family has always lived in the
rainforest.

Page 87
H
1 How long have you studied the
Kapok Tree?
2 How long has this tree been in the
forest?
3 How long have tourists visited this
part of the forest?
I
1 ’ve been … for
2 ’ve been … since
3 haven’t written … since
4 ’ve seen … since
5 ’ve met … since
6 ’s lived … for
7 hasn’t been … for
8 haven’t eaten … since
J
Students’ own answers

Oxford Discover Grammar  Student Book 4 Answer Key  © Oxford University Press

Unit 18
Page 88

B
Not all reefs are made of coral.
Since the 1970s, people have made
artificial reefs with metal objects
which include old trains, cars,
airplanes, refrigerators, boats, and
even bridges. These wrecks make
artificial reefs.
Coral reefs are important for sea life.
Thousands of different species live
and grow on them. Sadly, fishing,
tourism, and global warming have
damaged them. The new metal
reefs make homes for marine life,
like plants, shellfish and other fish.
So, fishermen move away from the
fragile coral reefs and begin fishing
in the new places. Artificial reefs
attract divers who like to explore
them.
There are all kinds of artificial reefs
around the world. In 2001, people
sank a huge ship off the coast in
Florida. In 2008, they dropped forty
New York City subway cars into
the ocean. Some marine biologists

and conservationists don’t agree
with artificial reefs. They think they
pollute the sea. What do you think?
C
1 T
2 T
3 T
4 F
5 T
6 F

Page 89
B
1 My aunt has lived in Australia since
2004.
2 ✓
3 ✓
4 Last year, she took some amazing
underwater photos.
5 ✓
C
1 has
2 has visited
3 went
4 explored
5 saw

13

Page 90
D
1 started
2 went
3 painted
4 looked
5 has already written
6 have worked
7 have said
E
1 f
2 a
3 d
4 b
5 e
6 c
F
1 Yesterday, in science class I learnt
about coral reefs.
2 Coral reefs have existed for
millions of years.
3 My dad’s seen lots of coral reefs.
4 He started diving as a child
because he lived by the beach.
5 I’ve gone diving with my dad a few
times.
6 We saw amazing fish last summer.
7 We went to the Red Sea last year.
8 It was a great vacation and I didn’t
want to go home.

Page 91
G
When Jason deCaires Taylor was a
child, he lived in Europe and Asia.
He enjoyed diving in the coral
reefs of Malaysia. He loved the sea
and nature. He loved art too, so he
studied art in college. Jason has
done many things in his life. When
he left college, he became a diving
instructor. He also became an artist
and a photographer.
H
1 has created
2 made
3 went
4 have had
5 created
I
Students’ own answers

Module 9 Review
Page 92
A
1 for
2 since
3 since
4 for
5 since

6 since
7 for
8 for
B
1 Lucy has been in California for six
months.
2 She has been at her new school
since January.
3 She has made lots of friends since
she started.
4 She hasn’t emailed her old friends
for two days.
5 Her dad has worked in a forest
since they arrived.
C
1 How long have you lived in
California?
2 How long have you known your
new friends?
3 How long have you lived in your
new house?
4 How long have you studied
English?
5 How long has your dad had his
new job?
6 How long has he been interested
in forests?

Page 93
D

1 arrived
2 went
3 was
4 ’ve had
5 ’ve read
6 ’ve heard
E
1 for
2 since
3 saw
4 done
5 swam
F
Students’ own answers

Oxford Discover Grammar  Student Book 4 Answer Key  © Oxford University Press

14