1、.提醒年轻人网上慎重交友，很有必要。

Its necessary to warn the young people not to_______ online carelessly.

2、不要抱怨学校，你们可以解决这些问题.

Don't complain about the school. You can_________ these problems.

3、必须采取措施来阻止此类事故发生

_______he done to stop this kind of accident from happening.

4、人们称赞这部根据中国历史上一个真实事件创作的歌剧

People _______of the opera which is based on the real event in Chinese history.

5、我想让老师和父母为我而自豪

I want to make my parents and teachers be ______me.