补全对话。

A: What can I do 1              you? Madam.

B: Yes, please. I want to 2              a pair of shoes.

A: 3              colour do you need?

B: Black.

A: What 4              do you want?

B: Size 38.

A: What about this one?

B: May I try them on?

A: OK.

B: How 5              does it cost?

A: Twenty yuan.

B: I'll take it. Here is the money.

A: Thank you, goodbye.