1 . —Mr. Yang, when shall we leave school this afternoon?
—Not until the classroom ________.
—Not until the classroom ________.
A.has cleaned | B.will clean | C.will be cleaned | D.is cleaned |
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2 . 应该发展清洁可再生能源。
________________ should be developed.
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3 . After he ______ (clean) his bedroom, he watched the TV.
收拾好卧室后,他才看电视的。
收拾好卧室后,他才看电视的。
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4 . Does the way you thought of ______ (clean) the river make any sense? (所给词的适当形式填空)
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