选择合适的句子补全对话

A. What colour is it? B. What's in it? C. Thank you so much! D. Excuse me. E. Is it your schoolbag?

A: I lost my schoolbag.

B:

A: It's blue and white.

B: OK.

A: A storybook, two pens and a key.

B:

A: Yes, it is. B: Here you are.

A: