根据对话理解，选择最佳答案填空。
A: 1 I help you?
B: Yes, please! I 2 a T-shirt.
A: A T-shirt? What 3 do you want?
B: Red.
A: Have a look 4 this one! It's on sale.
B: Oh, it's really nice, 5 it is too short, can you give me a 6 one?
A: Ok! How about this red one?
B: En……, it's great! I like it! How much 7 it?
A: 25 dollars 8.
B: That's good. I'll 9 it.
A: Here you are!
B: Thank you 10!
，则
的值为 （ ）