从方框中选择适当的选项补全对话(其中右两项是多余的）

A. You can look for it in your bedroom． B．But where is my pencil? C. You must look after your things well． D．But where are my‘books? E. Thank you，mom． F．Is it on your desk? G．Here is my picture．

A: You do your math homework first, Paul
B: Oh, yes, mom.        I can’t find it.
A: ___
B: No, it isn’t there.
A: Is it in your backpack?
B: No, it isn’t.
A: ____
B: OK. Ah, it is here. It is under my desk.
A: ___
R; All right_