补全对话。根据对话内容。在空白处填写适当的话语,使对话完整。正确。

A: Can I help you?

B: . l want a sweater.

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

B: l 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.