1. 选择合适的单词完成句子。

A. Where   B. Why   C. What   D. Would   E. Do

1. （1） — you think English is very useful?

   — Yes, I do.

3. （2） — are you doing?

   — I am washing the dishes.

5. （3） — is your pen?

   — It's in the pencil case.

7. （4） — you like to go shopping with me?

   — I'm sorry, I'm busy now.

9. （5） — do you look so worried?

   — My little dog is missing.