补全对话。请阅读下列对话，从方框内7个选项中选择5个恰当的句子完成此对话，其中有两个句子是多余的。
A: Hi, David! Come in, please.
B: ___________________
A: I’m looking for information about London on the Internet.
I’m going to London for my holiday.
B: Aren’t you lucky! ___________________.
A: No, but my mother has been there 3 times. She told me there were many places of interest there.
B: _____________________________ .
A: I’m leaving at 6 a.m. on Saturday June 27.
B：Will you get there by plane ?
A: _________________________ 
B: Have you ever flown in a plane?
A: No, never.
B: Then. You must be excited when you fly in a plane.
A: Really? _____________________

A. When are you leaving? B. Have you finished your homework? C. Have you ever been to London before? D. Of course. E. What are you doing? F. I can’t wait for it G. Sorry.