从下面所给句子中选择恰当的句子完成下面对话，其中有两个多余选项。

A: Good afternoon. ___16___

B: Yes. I'd like to buy a shirt for my grandfather.

A: What a nice boy you are! ___17___

B: Size L.

A: OK. What about this one?

B: ___18___ Have you got any other colours?

A: Oh, yes. We have also got blue, brown and black.

B: Can I have a look at the blue ones? Blue is my grandfather's favourite colour.

A: Sure. Here you are.

B: It looks nice. ___19___

A: Ninety-nine yuan.

B: Oh, that's too much.

A: ___20___ There's a sale on today. Everything is half price.

B: OK. I'll take it.

A．	What size would you like?
B．	Can I help you?
C．	Well, I'm afraid this is a bit small.
D．	What's the matter with you?
E．	But wait a minute!
F．	Sorry, he doesn't like white.
G．	How much does it cost?