题目内容
5．I have seen the words．（一般疑问句）Have youseenthe words？
分析 --我已经看到了那些话．
--你已经看到那些话了吗？
解答 答案：Have；seen．考查一般疑问句．由have seen已经看见，可知是现在完成时态．变一般疑问句助动词have提前．第一人称I，变为第二人称you．第二个空用seen过去分词．答案是Have；seen．
点评 一般疑问句变法，要考虑助动词、be动词、情态动词等的用法，还要考虑时态、人称、固定用法．根据语境完成试题．
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Plant trees
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Recycle （回收）
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Clean up rubbish
（77）C By picking up rubbish，it can stop animals from dying because of eating rubbish for food．Last year，volunteers for the Great American Cleanup collected more than 200million pounds of rubbish．
Plant trees
Trees are very important．They help clean the air and give off oxygen（氧气）．（78）G Last year，volunteers planted more than 4million tress．
Recycle （回收）
（79）E When something is recycled，people will turn it into something new．Volunteers recycled more than 70million bottles last year．A company used them to make schoolbags for kids．This year they'll turn bottles into clothes．（80）F"It is wonderful to turn bottles into something fantastic，"says Mrs．Green．
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