题目内容：

补全对话（5小题，每小题2分，共10分）

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。

A: Hi, Mei. 1.　　　　　　　　.

B: Yes. I have just heard that I had got the chance to go to Switzerland on my student exchange program.

A: Really? How lucky you are!

B: 2.　　　　　　　　. You know I have to live with my host family. I have never been there before, so I don’t really know what I am supposed to do.

A: 3.　　　　　　　　. I know something about that. First, don’t be late. In Switzerland, it’s very important to be on time.

B: 4.　　　　　. I think I’ll have to buy a watch.

A: And you can’t visit other people’s homes without calling them first. If you want to visit your friends, you must call them first.

B: Oh, that’s pretty different from the customs in Colombia where I am from. 5.　　　　　　　　.

A: Yes, that’s the difference. Good luck!

B: Thank you!