1. 从方框中选择恰当的短语，并用其适当形式填空。

what's worse   in a bad mood    had better    write to    be harmful to

1. （1） Litter our environment.

3. （2） I you as soon as possible.

5. （3） It's dangerous here. You go home at once.
   

7. （4） Every time they went dancing, they ended up.

9. （5） It is getting colder., they don't have enough water.