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1·He often forgot how to behave well.

他经常忘记如何举止得体。

2·First, you should wear smart clothes and behave well.

首先，你应该穿着时髦的衣服，举止得体。

3·They agreed as long as I promised to behave well.

只要我保证好好表现，他们就同意了。

4·Every student should behave well and keep away from violence.

每个学生都应该端正行为，远离暴力。

5·Oh, I'll behave well.

嗯，我会好好表现的。

6·The children behave well.

孩子们行为良好。《新英汉大辞典》

7·I also behave well in school.

我在学校也表现得很好。

8·We were expected to behave well.

大家期望我们表现良好。

9·Some of you don't behave well in class.

你们当中的一些人在课堂上表现的不好。

10·Third, behave well.

第三，行为端正。