题目内容：

补全对话。根据对话内容，从右边方框中选出适当的选项补全对话。

 

A. It's silver.

B. Let's see where it may be.

C.I can't find my key to the bike.

D. It is small but mine is a big one.

E. So it may still be on the playground

A: Jim, you look worried. What's the matter?  

B: 1. I must have lost it.       

A: Is it in your pocket?   

B: No, it isn't.   

A: Is it in your schoolbag?   

B: No, it isn't, either.   

A: Don't worry.2.

B: I think I could drop it during the P.E. class 3.

A: What color is your key?

B:4.

A: Look, over there! Is that yours?    

B: No, it can't be mine. 5.

A: I'm afraid you have to go to the Lost and Found case to have a look.

B: Thank you all the same.  

A: You're welcome.