16.

  1. The woman's toothache.
  2. Teeth made of plastics.
  3. Tooth transplant.
  4. The medical school in New York.

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17.

  1. The woman prefers filling the bad tooth to taking it out.
  2. They both hate to have a tooth filled.
  3. They both would rather have a tooth filled.
  4. The man prefers to have the bad tooth filled rather than pulled.

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18.

  1. No body was doing anything to prevent tooth trouble.
  2. The filling stopped teeth from, falling out.
  3. Dentists put animals on the moon.
  4. Doctors can transplant hearts.

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19.

  1. It will not be realized in the near future.
  2. It is still at a trial period.
  3. It is but a dream.
  4. It has been widely practiced.

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20.

  1. He was sure the woman was joking.
  2. He had never heard about it.
  3. He thought it totally impossible.
  4. It had never been mentioned anywhere.

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M:How's your toothache?
W:It's gone, thanks. I went to the dentist last night and he took care of it.
M:Which tooth was it?
W:The last one on the upper right-hand side. It has a huge filling in it now.
M:I hate having my teeth filled. It's not just the pain I hate. I 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 on the moon, but they can't keep people from having trouble with their 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.
M: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 put into the hole where your own tooth came out.
M:Really? What makes it stay there?
W:So far they have only tried it with animals.
M:Do they hook the plastic tooth to the teeth beside it?
W:No. The plastic tooth is made with metal roots, and after a while the gums grow around the roots, so the tooth can't fall out.
M:Are you making this up?
W:No! Seriously, somebody at a medical school in New York has been working on it.
M:Well, it sounds like a good idea.