根据对话内容，在空白处填写一个适当的话语（话语可能是一个句子，也可能是一个短语或一个词），使对话完整。

A: Excuse me. Could you tell me where the doctor's office. is?

B: Yes, it's on the second floor, beside the escalator.

A: Mm.  First I need to buy a book.  1  ?

B: Yes, there is.YOLI can find Bible Books on the fourth floor.  2   the elevator.

A: Oh, I also need to exchange some money.

B: Yes. There is a   3   on the first floor.  It's right behind you.

A: Good.  I think that's everything.  Oh no.  There is one more place I need to go to.

B: Yes?

A:   4   where I can buy some shampoo?

B: Yes, there's a drugstore on the third floor.

A:   5  .  You've been very helpful.

B: You're welcome.