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        1. It's our duty to _____ people _____ too many tree.
          [     ]
          A. stop; cutting down    
          B. prevent; to cut
          C. keep; cutting down  
          D. make; cut down
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          在下列各句的空格內(nèi)填上一個適當?shù)耐暾膯卧~,該詞的首字母已給出。

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          2.Ninety d     by three is thirty.

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          根據(jù)下列句子及所給單詞的首字母,寫出各單詞的完全形式。
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