补全对话

A. Can I help you? B. OK. I'll take it. C. How do you like this dress? D. I like blue. E. How much is it?

Mum: Mary.

Mary: It's very pretty.

Assistant:

Mum: Yes.

Assistant: It's $ 99.

Mum: Oh, that's expensive.

Assistant: Do you like that blue skirt？

Mary: Yes.

Mum: OK. How much is it？

Assistant: It's $ 50.

Mum: