从右栏方框中选出能填入左栏空白处的最佳选项，其中有两项是多余的。
A: I'd like a dress, please.
B: How much is it?
C: See you then.
D: OK, I'll take it.
E: What can I do for you?
F: Could you give me a short one?
G: I don't like the color.
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W: Can I help you?
M: Yes. ____
W: Do you like the white one?
M: No, ____ That yellow one looks nice.
W: Yes. Please try it on.
M: Oh, it' s too long for me.____
W: Certainly. Here you are.
M: Good! This is nice.____
W: 30 dollars.
M:____
展开式中的常数项为