1. (2021三下·科尔沁左翼中旗期中) 补全对话

A. No, it isn't. B. Yes, it is. C. Mum, where is my ball? D. Is it under the desk? E. You're welcome.

A:
B: Is it in your toy box?
A:
B:
A: No, it isn't.
B: Is it under your chair?
A: Thanks, Mum.
B: