根据对话内容，填写适当的话语，使对话完整、正确。

A: Can I help you?

B:  . I want a sweater.

A: We have blue, yellow and red ones.  this one?

B: I don't like black. I like green.

A: Sorry. We  have green sweaters.

B: Can I have a look at the trousers?

A: Yes, please.  do you want?

B: Green.

A: Here you are.

B:  ?

A: 30 dollars.

B: I'll take them.