1. 从方框中选出下列句子的最佳应答语。

A. It's on the first floor. B. No, it isn't. C. OK! That's great! D. It's so big. E. Thank you.

1. （1） This is my bedroom.
3. （2） Is that a pencil box?
5. （3） Welcome to my school.
7. （4） Where is the kitchen?
9. （5） Let's go to the garden and water the flowers.