1. If we waste paper, we will save a lot of trees. A.repeat B.recycle C.rewrite D.remake
2. If we plant more trees inthe schoolyard, the school will become a place. A.greener B. darker C. dirtier D.more polluted
3. "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