根据下面的对话情景，在每个空白处填上一个适当的句子，使对话的意思连贯、完整。（只填序号即可）

A: Hello, Lucy! I haven't seen you for a long time.

B: Hello, Mike!

A: How long did you stay there?

B:

A: How do you feel about staying in London?

B: Everything was strange at first.

A: Oh, I think your English must have improved a lot.

B: Of course.

A: Who did you live with there?

B:

A: That's great! Oh, my mom is calling me. I'd better go.

B: See you later.

A. Many customs are different from ours. B. I lived with an English family. C. But I don't like living there. D. I stayed there for about half a year. E. I had a good time there. F. I couldn't understand much at first. G. I've just come back from London