A. exactly 16
B. nearly 16
C. exactly 15
D. less than 15
A. industrial pollution
B. the fresh water shortage
C. acid rain
D. population explosion
A. It contains a rich variety of animals and plants.
B. It is polluted by massive volumes of industrial wastes discharged into it.
C. It has 1,300 rare species that do not exist anywhere else in the world.
D. The government did not have the power to enforce laws and regulations.
A. industrial pollution
B. garbage
C. acid rain, industrial pollution and garbage
D. acid rain
A. We should use a lot of clean water.
B. We should encourage people to use safe water.
C. We should do something protect our water resources.
D. We should limit the clean water in the world.
A. whose
B. which
C. who
D. whom
A. What is the fax number?
B. What is the fax?
C. What do you want?
D. What the number fax?
A. The song
B. that
C. listened
D. was
A. has learnt
B. were learnt
C. learnt
D. had learnt
A. who
B. whose
C. whom
D. which
A. Energy
B. Natural gas
C. Machine
D. Chemical
A. was/ will
B. were/ will
C. am/ will
D. were/ would
A. Reliable
B. Efficient
C. Secure
D. Express
A. injuring/ taking
B. injured/ taken
C. injuring/ taken
D. injured/ taking
A. overlooking
B. overlooked
C. to overlook
D. overlooks
A. had helped you
B. would help you
C. helped you
D. would have helped you
A. calling
B. called
C. was called
D. was calling
A. research
B. researched
C. researching
D. researches
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