6. If we ________ waste paper, we will save a lot of trees.
A. repeat B. recycle C. rewrite D. remake
7. If we plant more trees in the school yard, the school will become a ________ place.
A. greener B. darker C. dirtier D. more polluted
8. “Why do you often forget to ________ the lights when you go out of the classroom?”
A. Turn on B. turn off C. close D. shut down
9. “What can we do ________ air pollution?”
A. reduce B. to reduce C. reducing D. to reducing
10. “Do you think robots can work longer than people ________ getting tired?”
A. but B. with C. without D. of
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