根据下面对话中的情景，在每个空白处填人适当的语句，使对话恢复完整。
A: Summer holiday is coming next month. What are you going to do?
B: We are going to Xi'an. 1
A: Oh, your grandparents must be very happy to see you again.
B: Of course they are.
A: 2
B: About four or five days.
A: 3
B: No, by train. Taking a bus is a little dangerous. 4
A: Maybe my parents will take Dick and me to some cities in the south.
B: That'll be great. 5
A: Maybe Hainan, Shenzhen and Guangdong.
B: Oh, They are all great cities. I think you'll have a good time.
A: You, too.
