A、Have one’s heart transplanted. B、Put men onto the moon again. C、Advance the tooth-filling technique. D、Have one’s teeth transp

M: Mary. I heard that you are suffering from toothache these days. How’s that with you now?
W: It’s gone, thanks. I went to the dentist last night, and he took care of me.
M: What exactly is troubling you then?
W: The last tooth on the upper right-hand side. It’s been severely decayed and finally I had it filled at the dentist’s.
M: I hate having my teeth filled. It’s not just the pain I hate. I also hate the sound of drilling.
W: So do I. I’d rather have a tooth pulled than filled.
M: Have you ever had one of your teeth pulled?
W: No, but the one the dentist just filled will have to come out someday. He says it can’t be filled again.
M: Teeth keep causing trouble, and nobody really does anything about it. I can’t understand why.
W: They can put men onto the moon, but they can’t keep people from having trouble with teeth.
M: They can give somebody a different heart. Why can’t they give him different teeth?
W: I’ve heard they’re working on that. My dentist says they’re working on tooth transplant right now.
M: But on second thought, I’m not sure I’d want to eat with some other person’s teeth.
W: Well, that’s not how it works. The idea is to develop a plastic tooth that can be placed into the hole where your own tooth came out.
M: Really? It sounds like a good idea.
Questions 23 to 25 are based on the conversation you have just heard.
23. Why did the woman go to the dentist?
24. What does the man hope the dentists can do?
25. What does the woman’s dentist tell her?