用适当形式填空:Are many ways _______(try) to stop people from cutting down so many trees?
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用适当形式填空:Was the work __________(结束)by him yesterday?
用适当形式填空:This coat _________(wash) well.
用适当形式填空:Children should ________ good care of.
用适当形式填空:I’m often _________(警告)not to copy others’ homework.