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.

按控制区管理的规定，工作人员离开控制区时，必须（）。

A.用6150AD5+AD17对安全帽进行表面污染检查

B.通过C1门进行工作服表面污染检查

C.通过C2门进行身体表面污染检查

D.用CPO对随身携带的小件物品进行表面污染检查