1.除了英语，你更好再学一门外语。

2.学生应该在上课之前完成家庭作业。

3.你们应该充分利用每一个机会说英语。

4.简而言之，每个人都应该为自己的行为负责。

1.You'd better learn another foreign language except English.

2.Students should finish homework before classes.

3.You should make use of every opportunity to speak English.

4.General speaking, everyone should be responsible for his behavior.