pet sb answer key u11

11 The natural world
Lead in
1

1A

2

a natural habitat
b litter

2C

3D

Reading

Grammar

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4B
c dump
d global warming

a3

2

a zero = c, f
first = a, b, d, c

b1 c2

d6 e5

f4

3 Suggested answers
a
b
c
d
e

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1

1992 when the ducks fell overboard
29,000 the number of ducks
10,000 the number of containers lost every year
3,000 the number of kilometres the ducks
travelled to the North Pole

2

1 B If students wrongly answer D, explain that
the text says the ducks have helped scientists
understand how ocean currents work but the
text doesn’t explain in detail how the water
actually moves in the ocean.

2 A Dr Ebbesmeyer ... realised that observing the
ducks ... can help us understand how ocean
currents work (line 17).
3 C The ducks are bleached and worn after so
much travelling (line 30). The expression (to
be) bleached means ‘to lose colour through
being exposed to the sun’.
4 C If any students wrongly answer D, explain
that although the final paragraph mentions
that ‘some of the ducks have been found’, this
is not the main point of the article.

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1

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…
…
…
…
…

global warming will get worse.
we don’t take action now.
we will pollute the sea.
we keep flying by aeroplane so much.
don’t leave the TV on.

Vocabulary
1
2
3
4

on
in
on
from

Grammar

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5
6
7
8

in
of
for
about

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1

a had
b would love / ’d love

c were / was

3

1
2
3
4
5

d would buy / ’d buy
e hit
f would be / ’d be

unless
I’d take / I would take
you study
don’t / do not put
wouldn’t be / would not be

PET Result © Oxford University Press


Listening
2

3

a ✗ I’d never been particularly interested in space.
b ✓ There are thousands of bits of rubbish up there

and the amount is growing.
c ✗ Skylab … fell into the Indian ocean and across
Western Australia.
1 B I came across a story = I found / discovered
a story by accident; I wasn’t looking for it.
2 A We can eliminate options B and C because
the references to books and the Internet are
both negative: There aren’t many books ... the
Internet wasn’t that helpful.
3 B Adam says the bits of spacecraft and
astronauts’ tools are things you would expect,
but shows he is surprised by the ordinary
rubbish, because he says amazingly.
4 B The size of the rubbish and the material it’s
made from is not important: it can be of any
size ... and material, so we can eliminate
options A and C.
5 C Adam doesn’t say that there are a lot or
that numbers are growing. He says that the
amount of rubbish is increasing but not the
number of accidents, though perhaps the
number of accidents might increase as well
at some time in the future.
6 C We can eliminate option A because it fell on
land (Western Australia) as well as sea. We
can eliminate option B because bits of it fell
(i.e. it fell in two places but it didn’t break
into just two pieces).

Vocabulary

1

a
b
c
d

turn
turn
throw
pick

Speaking
3

Writing

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1

Elena’s letter is about air pollution. She helps by
cycling to school every day.

2

Dear Maria
Thanks for your letter. It was great to hear from you.

You wanted to know about some of the environmental
problems in my country. In my opinion, the worst
thing is air pollution. There are too many cars in
our cities. If people used their cars less, it wouldn’t
be so bad.
Last month, I bought a bike and now I cycle to
school every day. This is much better for the
environment and it keeps me healthy too.
Write soon!
Elena

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e run
f fill
g give

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1 c
2 b

PET Result © Oxford University Press

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