Answer Key
Cha
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1
Sociology
Preview
Reading 1
Should Kids Change Their Names?
A.Look at the pictures. Circle the
right words.
Comprehension Questions
Extra Practice
1.southern
2. teenager
3. adulthood
4. increase
B.What do you think is the right
answer? Check () it.
1.Apps
2. Number of people
3. Ethics
4. Friends
5. A decrease in importance
C.Work with a classmate. Try to write
three ideas for each box.
[Answers will vary.]
D.Add a part from the “First“ box to
a part from the “Last” box to make
eight words or phrases. Write the
words and phrases below.
[Order may vary.]
1. adulthood
2. app store
3. childhood
4. decrease
5. increase
6. social media
7. southern
8. teenager
1. c
2. a
3. c
1. guide
4. being older
Reading 2
4. b
2. Some
5. because
5. b
3. young years
Does Wealth Affect Ethics?
Comprehension Questions
1. b
2. a
3. c
4. a
5. c
Extra Practice
1. ethics
4. tended
Reading 3
2. experiments
5. kindly
3. candy
The Age for Marriage
Comprehension Questions
1. c
2. a
3. b
4. a
5. c
Extra Practice
1. wed
4. common
Reading 4
2. tradition
5. pair
3. Leaders
How Social Media is Changing the World
Comprehension Questions
1. c
2. a
3. b
4. c
5. a
Extra Practice
1. connect
4. products
Reading 5
2. billion
5. influencing
3. app
Homes Around the World
Comprehension Questions
1. b
2. a
3. b
4. c
5. b
Extra Practice
1. Weather
4. instead of
2
Answer Key
2. Big holes
5. strangers
3. Ice houses
Cha
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2
Technology
Preview
A.Match two phrases with each type of
technology.
1. a, g
2. c, f
3. b, h
4. d, e
B.Match the word with the right
definition.
1.e
2. d
3. c
4. a
5. b
C.Talk with a classmate. How often
does he or she use each type of
technology?
[Answers will vary.]
D.Read the clues. Then use the words in
the box to complete the puzzle.
Across
2. keyboard
3. jewelry
5. device
9. smartphone
10. access
Down
1. headphones
4. layer
6. virtual
7. laser
8. sensor
Reading 6
Big Data and You
Comprehension Questions
1. b
2. a
3. b
4. c
5. b
Extra Practice
1. information
4. helpful
Reading 7
2. patterns
5. programs
3. government
The History of the Internet
Comprehension Questions
1. b
2. a
3. b
4. c
5. b
Extra Practice
1. group
4. join
Reading 8
2. Schools
5. data
3. web
3D Printing
Comprehension Questions
1. b
2. a
3. a
4. c
5. a
Extra Practice
1. inventions
4. medical
Reading 9
2. object
5. chocolate
3. layers
The History of the Smartphone
Comprehension Questions
1. c
2. c
3. a
4. b
5. b
Extra Practice
1. mixes
4. sell
Reading 10
2. texts
5. commonly
3. schedule
Virtual Reality
Comprehension Questions
1. a
2. a
3. b
4. b
5. c
Extra Practice
1. reality
4. headphones
2. sensors
5. soldiers
3. device
Answer Key
3
Cha
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3
Geography
Preview
A.Look at the pictures. Write the right
words in the blanks.
1. eruption, caldera
2. crystals, glaciers
3. western, steam
4. surface, climate
B.Read the sentences. Circle True or
False
1.False
2. True
3. False
4. False
5. True
C.Work with a group of classmates. Try
to name one place for each of the
following.
[Answers will vary.]
D.Use the words in the box to complete
the puzzle.
1.caldera
2. glacier
3. tightly
4. steam
5. eastern
6. tectonic
7. erupt
The secret word: climate
Reading 11
Climate Change, Sea Change
Comprehension Questions
1. b
2. a
3. c
4. c
5. b
Extra Practice
1. Weather
4. high water
Reading 12
2. ice mountains
5. usual
3. without salt
Is Earth Running Out of Water?
Comprehension Questions
1. b
2. a
3. a
4. b
5. b
Extra Practice
1. amount
4. concerned
Reading 13
2. liquid
5. wisely
3. solid
Glaciers
Comprehension Questions
1. b
2. a
3. c
4. b
5. a
Extra Practice
1. snow
4. crystals
Reading 14
2. steps
5. different
3. pressed
The Yellowstone Caldera
Comprehension Questions
1. c
2. b
3. a
4. a
5. b
Extra Practice
1. caldera
4. jets
Reading 15
2. erupted
5. wonder
3. liquid
The Ring of Fire
Comprehension Questions
1. b
2. b
3. a
4. c
5. a
Extra Practice
1. erupting
4. made
4
Answer Key
2. explosions
5. earthquake
3. blocks
Cha
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4
History
Preview
A.Match the picture with the right
word.
1.d
2. f
3. h
4. g
5. c
6. b
7. e
8. a
Reading 16
Comprehension Questions
1. b
2. c
1. century
4. cannons
Reading 17
Extra Practice
[Answers will vary.]
D.Look at each group of words. Circle
the one that does not belong. Why
doesn’t it belong?
1. water (not solid)
2. dollar (not a unit of measure)
3. estimate (not an action to take/acquire)
4. researcher (not a ruler/leader)
5. tomb (not something for fighting)
4. a
5. b
2. increased
5. attacks
3. tower
The Pig War
Comprehension Questions
1. a
C.Answer these questions. Then ask
your classmates. Are your answers
similar?
3. a
Extra Practice
B.Choose the right word.
1.a
2. c
3. b
4. a
5. a
Castles in Europe
2. c
1. disagree
4. asks for
Reading 18
3. b
4. c
2. Fights
5. leader
5. b
3. don’t want
A Great Deal for the US
Comprehension Questions
1. b
2. c
3. a
4. c
5. b
Extra Practice
1. dollars
4. produce
Reading 19
2. valuable
5. deal
3. discovered
The Terracotta Army
Comprehension Questions
1. a
2. c
3. b
4. a
5. c
Extra Practice
1. Earth
4. tombs
Reading 20
2. Kings
5. Guns
3. buried
The Brick Kingdom
Comprehension Questions
1. a
2. b
3. a
4. c
5. b
Extra Practice
1. kingdom
4. brick
2. population
5. memory
3. death
Answer Key
5
Cha
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5
Economics
Preview
A.Which of the following are associated
with banks or money? Circle six
words or phrases.
account, crowdfund, fee, loan, minimum
wage, tax
B.Match the parts to make correct
sentences.
1.When you need money, you can get a
loan from a bank or crowdfund online.
2. The concept of “free” is a fallacy
because someone must always pay.
3. A monopoly is bad since customers
have no choice for a good or service.
4. Under universal healthcare, one doesn’t
pay much to see doctors, but taxes are
high.
5. If minimum wage goes up, employees
will be happy; employers will not.
Reading 21
Comprehension Questions
1. c
[Answers will vary.]
D.Fill in the blanks with words from the
box to make common phrases.
1. quality
2. market
3. crowdfund
4. fallacy
5. employee
6. taxes
7. account
8. universal
9. loan
10. balance
2. a
3. b
4. c
5. a
Extra Practice
1. need
4. items
Reading 22
2. amount
5. make even
3. exist
The Minimum Wage
Comprehension Questions
1. b
2. c
3. b
4. a
5. c
Extra Practice
1. wage
4. employees
Reading 23
2. owners
5. benefit
3. products
How Monopolies Affect Economies
Comprehension Questions
1. b
C.Work in groups with your classmates.
Can you think of examples for all of
these ideas related to economics?
Share your examples with the class.
Supply and Demand
2. b
3. a
4. c
5. a
Extra Practice
1. full control
4. level
Reading 24
2. Buyers
5. interest
3. items
The Job of Banks
Comprehension Questions
1. a
2. c
3. c
4. a
5. b
Extra Practice
1. account
4. combined
Reading 25
2. loans
5. amount
3. argue
The Economic Fallacy of Free
Comprehension Questions
1. a
2. b
3. c
4. c
5. a
Extra Practice
1. For all
4. really
6
Answer Key
2. Fees
5. excite
3. amount
Cha
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6
Literature
Preview
A.Look at the pictures. Write the right
words.
1. profits
2. publish
3. market
4. advertisement
5. copyright
6. religious
7. political
8. journals
B.Write the right word in each blank.
1. poet, weird
2. ban, political
3. freedom, publish
4. protection, copyright
Should Books Be Free to Read Online?
Reading 26
Comprehension Questions
1. b
2. a
3. c
1. library
4. since
2. millions
5. profit
Comprehension Questions
1. c
2. a
3. b
1. business
4. Touchable
2. online
5. made
5. c
3. because of
Copyright Laws
Reading 28
1. c
1.Homer
2. Shakespeare
3. Twain
4. Einstein
4. c
Extra Practice
3. online
The Decline of the Printed Word
Reading 27
Comprehension Questions
D.Read about each writer. Then write
the right name in each blank.
5. b
Extra Practice
C.Work with a classmate. Think about
authors and literature. Write two …
[Answers will vary.]
4. a
2. a
3. b
4. a
5. b
Extra Practice
1. Copyrights
4. journals
2. protect
5. research
3. encourages
Banned Books
Reading 29
Comprehension Questions
1. b
2. b
3. b
4. b
5. a
Extra Practice
1. unsafe
4. show respect
Reading 30
2. national
5. independence
3. government
The Language of Shakespeare
Comprehension Questions
1. c
2. b
3. a
4. c
5. c
Extra Practice
1. amazing
4. certain
2. language
5. chance
3. weird
Answer Key
7
Cha
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7
Space
Preview
A.Check () the right answer.
1. one centimeter
2. a spacecraft
3. a telescope
4. Jupiter
B.Write the right word in each blank.
Two words will NOT be used.
1.solar
2. balloons
3. surface
4. Astronomers
5. magnetic
6. cycle
C.Work with a classmate. Talk together
about the questions below.
[Answers will vary.]
D.Match the similar words and phrases.
[Order may vary.]
1. astronaut and explorer
2. force and gravity
3. mechanical person and robot
4. top layer and surface
5. planets and solar system
6. rocket and spacecraft
Reading 31
Earth’s Moon
Comprehension Questions
1. c
2. c
3. a
4. b
5. c
Extra Practice
1. goes around
4. speed
Reading 32
2. found
5. Gravity
3. empty places
Our Star, the Sun
Comprehension Questions
1. b
2. c
3. c
4. b
5. b
Extra Practice
1. gases
4. sunspots
Reading 33
2. planet
5. areas
3. magnetic
Living on Mars
Comprehension Questions
1. a
2. b
3. c
4. c
5. b
Extra Practice
1. Space explorers
4. get along with
Reading 34
2. arrive at
5. situation
3. get ready
An Eye on Other Planets
Comprehension Questions
1. a
2. c
3. a
4. b
5. a
Extra Practice
1. solar system
4. Astronomers
Reading 35
2. planets
5. search
3. telescopes
Water Power for Space Travel
Comprehension Questions
1. a
2. c
3. b
4. c
5. a
Extra Practice
1. distance
4. gas
8
Answer Key
2. Rockets
5. currently
3. degree
Cha
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8
People
Preview
A.Look at the picture. Choose the right
sentence.
1.b
2. a
3. b
4. a
B.What do you think is the right answer
to the question? Circle the right word.
1.Independence
2. In meters
3. Jungle vines
4. Military forces
5. Adulthood
Reading 36
How to Succeed in Surfing
Comprehension Questions
1. b
2. a
3. c
1. surfer
4. competitions
Reading 37
2. shark
5. positive
Comprehension Questions
1. a
2. c
3. b
1. Customs
4. freedom
2. think
5. to wed
1. a
1. c
2. a
3. f
4. b
5. e
6. d
4. c
5. c
Extra Practice
3. survived
Coming-of-Age Traditions
Comprehension Questions
D.Match the phrases to the right
examples.
5. c
Extra Practice
C.Work with a classmate. Ask the
questions below and write his/her
answers. Then share the answers with
the class.
[Answers will vary.]
4. a
Reading 38
2. c
3. spiritual
Twin Studies
3. b
4. c
5. a
Extra Practice
1. twins
4. adults
Reading 39
2. exactly
5. diseases
3. separated
Wonder, Study, and Learn!
Comprehension Questions
1. a
2. c
3. c
4. a
5. c
Extra Practice
1. birth
4. Love
Reading 40
2. awe
5. interested
3. end
To Make Her Country Free
Comprehension Questions
1. a
2. a
3. c
4. b
5. c
Extra Practice
1. military
4. lead
2. government
5. freedom
3. voted
Answer Key
9