通读下面的对话，根据上下文补全对话内容。

A: Can I help you?

B: Yes, please.     1   . Where are your T-shirts?

A: Come here, please. We have T-shirts in many colors.     2   ?

B: I like white. Can I have a look at that one?

A: OK.    3     .

B: It looks nice.    4    ?

A: Oh, our T-shirts are on sale. You can buy it for only 20 yuan.

B: Great!    5    . Thank you.

A: You're welcome.

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