补全对话

A.When is Ann’s birthday? B.I’ll pick you up at 9:00. C.When are you free? D.I’m not sure. E.I’m sorry, but I have anothing thing to do tomorrow. F.I’m thinking about going to buy a gift for her. G.I think there will be twenty people at her party.

A: Next Friday is Ann’s birthday.
B: Oh, I forgot it.Let’s go to buy gifts together.
A:   what about the day after tomorrow?
A: OK, that’s fine.What time shall we meet?
B:
A: Good! How many people will there be at Ann’s party?
B:   Maybe thirty or forty.
A: I can’t wait.I believe we’ll have fun at the party.
B: Sure we will.