1. 选词填空，使句意完整。

happy,   should,   afraid,   about,   worried

1. （1） What I do?

3. （2） The mice are of the cats.

5. （3） My parents are about me, because I am ill.

7. （4） —What is the book ?

   —It is about the cat.

9. （5） My mother bought me a new bike, I am very