用所给短语的适当形式填空。
be harmful to, three times a day, take part in, catch a cold, join
【1】Polluted water and air _______________ to people’s health.
【2】Do you _________________ the competition?
【3】Most of people have meals _______________
【4】He didn’t go to school because he _______________
【5】He _______________ the army last year.
【答案】【1】are harmful to
【2】take part in
【3】three times a day
【4】caught a cold
【5】joined
【解析】【1】句意：污染的水和空气对人们的健康有害。根据be harmful to,对---有害，Polluted water and air两个主语；故填are harmful to
【2】句意：你参加比赛吗？根据competition 和选词，可知是参加take part in；故填take part in
【3】句意：多数人一天吃三顿饭。根据日常生活和选词可知是一天三次；故填three times a day
【4】句意：他没去学校，因为感冒了。根据He didn’t go to school和选词，可知是感冒了，根据didn’t可知是过去时态；故填caught a cold
【5】句意：去年他参军了。根据jion参加（组织），根据last year可知是过去时态；故填joined
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