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　　70.常用固定短语

　　finish doing sth 完成某事

　　She finished cleaning the room.

　　practise doing sth 练习做某事

　　You'd better practising reading and speaking English every day.

　　be good at doing sth 擅长做某事

　　I am good at playing basketball.

　　go on doing sth 继续做某事,指前后做的是同一件事。

　　The students went on talking and laughing all the way.

　　Go on doing the other exercise after you have finished this one.

　　be busy doing sth 忙于做某事

　　I am busy in cleaning my room.

　　see/hear/watch sb doing sth 听/看/观察到某人正在做某事

　　I hear him singing.

　　be afraid of doing sth 担心(害怕)会发生某事

　　My little sister is afraid of staying at home alone.

　　be interested in doing sth 对做某事的兴趣.

　　I'm interested in playing games.

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