用适当形式填空：Was the work __________（结束）by him yesterday？
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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.
用适当形式填空：He couldn’t explain why dinosaurs ___________ (消失).
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