A、At a bookstore. B、At the dentist’s. C、In a restaurant. D、In the library. B对话中男士提到do another tooth（补另一颗牙）和fill the other cavity

W: Mike and I are having a party next week. We wonder if you and Susan would be free to join us.
M: Sounds great. But I’d better talk to Susan before we say yes.
Q: What does the man imply?

M: I’m afraid there won’t be time to do another tooth today. Make sure you don’t eat anything like steaks for the next few hours, and we’ll fill the other cavity tomorrow.
W: All right. Actually, I must hurry to the library to return some books.
Q: Where does the conversation most probably take place?