A. natural gas
B. oil
C. coal
D. oil, gas, natural gas
A. wind
B. the sun
C. water
D. the sun, wind, water
A. plentiful
B. limited
C. natural
D. necessary
A. we are now depending so much on oil, coal, and natural gas
B. other sources of energy can come from the sun, wind, and water
C. we are looking forward to seeing great changes
D. we are looking for other alternative sources of energy
A. True
B. False
A. True
B. False
A. True
B. False
A. True
B. False
A. tickets
B. weapons
C. spaceships
D. products
A. but also
B. towards
C. with
D. into
A. as good as
B. like as
C. accounts
D. such as
A. burnt
B. bill
C. went off
D. banged
A. reduced
B. audience
C. observatories
D. watcher
A. sent back
B. returned to
C. separated from
D. quarter
A. weightlessness
B. longer
C. wavelengths
D. length
A. space
B. atmosphere
C. with
D. universe
Ultimately, these innovations will save money as well as (20) the earth’s resources.
A. conserve
B. drivers
C. tourists
D. astronauts
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