补全对话。

A: 1._____can I do for you?

B: I 2._____ a bag of sports.

A: We have bags 3._____ all colors. They are on 4._____ now.

B: Oh, that's great.

A: 5._____  6._____ do you want?

B: Green.

A: Let 7._____ have a look. What 8._____ this one?

B: It's too big. Do you have a 9._____ one?

A: Yes. How about this green one?

B: It is very nice. I'll 10._____ it.  11._____  12._____ is it?

A: Twenty dollars.

B:  13._____ is the money.

A: Thank you.

B: You're 14._____.

贸易合同签订之后的合同管理涉及的内容不含( )。

A．预收款的跟踪

B．合同文本与实际情况差异的纠正

C．合同变更的跟踪

D．合同实施过程的索赔