根据对话内容，从方框中选择适当的句子补全对话(有两项是多余的)。

A: Good morning.

B: Yes, please. I want a shirt. Do you have shirts at a good price?

A: The blue and the white shirts are on sale.

B: White.

A: Here you are.

B:

A: It's only 30 dollars.

B: Thank you.

A: You're welcome.

A. What color do you want? B. Sorry, we don't. C. Can I help you? D. How much is it? E. What about this white one? F. I'll take it. G. Yes, we do.