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It won't work: ________ ________ ________ (第一) , it's a bad idea; and secondly, it will cost too much.

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When we arrived home, mother was ________ ________ ________ (忙于做饭) .

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________ a ________ ________ (在某种程度上) drinking alcohol does harm to our health.

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All of the students are encouraged to ________ ________ (参与) the discussion.

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What he did ________ ________ (促进) bettering the situation.

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We should try our best to ________ ________ ________ (与……步调一致) the change of society.

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The school ________ ________ ________ (以……自豪) its academic record.

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The policeman ________________ (怀疑他提供假情报).

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I ________________ (埋首于学习中). In return, I gained great success.

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What made you ________________ (怀疑钱是他偷的)?