根据对话内容，在空白处填入恰当的表达。

A: Can I help you?

B: Yes. I want to buy some tickets for the concert next week.

A:   1   tickets do you want?

B: Three.

A: Which performance do you like, Thursday evening   2   Sunday evening?

B: The day is not important, but my friends and I want to sit together.

A: Let me see if I can help you. You know the singer is very popular and   3   sell well.

B: I know.

A: Ah, there   4   to be three such seats for Sunday's concert.

B: That's fine. How much are they?

A: 30 dollars each, 90 dollars in all.

B: Here's 100 dollars.

A: Thank you.  5   , your tickets and the change.