补全对话，从方框内选择适当的选项完成对话。

A. What are you doing? B. What about this one? C. Can I help you? D. How much is it? E. I’ll take it. F. What size does your son wear? G. What do you like?

A: Good morning, Madam!     
B: I’d like a T-shirt for my son.
A:      
B: Size L. He is a tall boy.
A:       It’s made in China.
B: OK. Let me have a look.       
A: 120 yuan. It’s popular now.
B: But I’m afraid it’s a little more expensive and I don’t like the color.
A: Do you like the black one? It’s only 80 yuan.
B: Hmm, it looks nice.        
A: Here you are.
B: Thank you.
A: You’re welcome.