1. We should not_____ (坏,破坏) our environment. 2. The school is making_____(努力) to help poor students. 3. Smoking can_____(引起) lung cancer. 4. The policeman_____(命令) the thief to raise his hands. 5. It's wrong to_____(污染) the village. 6. You must____(签名) in when you come to the center. 7. My mother doesn't____(允许) me to play computer games.
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