用恰当的词语填空，完成对话。每空一词。
A: Good morning, sir! Can I 1______ you?
B: I would like to buy an MP4.
A: Here is a new kind. Please have a 2______
B: OK. Let me try to listen to it.
A: Is it loud and clear enough?
B: Yes, it is. But I don't like black. Have you got a red one or a white one?
A: Yes. How about this red one?
B: It's nice. How 3______ is it?
A: 300 yuan. Is it OK?
B: Oh, dear! That's too expensive. Can it be 4______?
A: You can pay 50 yuan less. That's the last price.
B: OK. I'll 5________ it. Here's the money.
