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

M: I have passed the Teacher Certificate Examination and I wonder if I can get the job of the teaching assistant.
W: Yes, certainly. But if only you had sent in your application in time.
Q: What does the woman 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?