A：Hello, Simon. Have you seen Billy this afternoon ?

       B：No, Maria. Why ?

A：Oh, dear. I can’t find him anywhere. I don’t know what to do. He should have been back an hour ago.   1    

B：Don’t worry, Maria. He could have, but he probably didn’t. Did anything happen this morning?   2 

       A：His birthday party.

       B：Is it possible that you said something to upset him ?

       A：I must have. I told him we hadn’t received Mr. White’s reply to our invitation.

       B：  3  

       A：No, he left home right after that.    4  

B：Maria, I’m sure there is nothing to worry about. He is probably on his way to see Mr. Smith, or else he is with Mr. White.

       A：Oh, wait! There he is ! And Mr. Smith is with him.   5   He must have been to Mr. Smith’s.

       A．I suppose I should have called you earlier.

       B．Anything else?

       C．I wonder if he could have had an accident.

       D．I’m afraid he might have an accident.

       E．Where could he have been?

       F．You are right, Simon.

       G．What were you talking about before he left?

DGBAF