1 . 覆水难收。（为洒出的牛奶哭泣是没有用的。V-ing用法）
________________________________ over the spilt milk.

3 . I wake up to the sound of the wind __________ the cloth of my tent. (根据句意单词拼写)

4 . 众所周知，光说不做是没有用的。
As we all know, it is no use ____________.

5 . 对肢体语言作出反应是教师职责的重要组成部分。
________________ is an important component of being a teacher.

6 . In order to finish the teachers’ assignments , students have to stay up late, which contributes to their body _______ _______ (崩溃，垮掉) （根据汉语提示完成句子）