1. 给下列句子选择合适的答语。

A. He's cleaning the room. B. Thank you. C. Sorry，I can't. D. Yes，you are. E. She's at the supermarket.

1. （1） Who can help me?
3. （2） Am I going to have a birthday party?
5. （3） Where's your mum?
7. （4） What is he doing?
9. （5） Happy Birthday，Jack.