A. in
B. with
C. for
D. on
A. sample
B. model
C. modern
D. mode
A. saving-energy
B. energy-saved
C. energy-saving
D. save-energy
A. pay
B. take
C. get
D. cut
A. if
B. though
C. since
D. once
A. Almost
B. Most
C. Mostly
D. Every
A. well
A. to close
B. closed
C. open
D. opening
A. be
B. been
C. being
D. to be
A. are
B. were
C. have been
D. had been
A. because
B. so
C. although
D. but
A. the sun, wind, water
B. water
C. wind
D. the sun
A. the moon
B. the sun
C. stars
D. the Mars
A. we are looking for other alternative sources of energy
B. we are looking forward to seeing great changes
C. we are now depending so much on oil, coal, and natural gas
D. other sources of energy can come from the sun, wind, and water
A. natural
B. necessary
C. plentiful
D. limited
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