1. 选择正确的词语填空。

pay attention to     in danger of     in peace     die out     do harm to

1. （1） This kind of bird may in the world if we don't protect it.
3. （2） Leave him ; he's trying to work.
5. （3） He is losing his job if he goes on like this.
7. （4） You should your teacher in class.
9. （5） Working without rest will our health.