16.

  1. To have his cleaned and examined.
  2. To extract his bad teeth.
  3. To see if Dr. Allen would give him a job.
  4. To recommend a friend.

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17.

  1. He has a bad tooth.
  2. He's leaving next week.
  3. He will be busy next week.
  4. He needs to find a job.

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18.

  1. He has trouble with his teeth.
  2. He has no free time this week.
  3. He has work to do this week.
  4. He won't start work until next Monday.

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19.

  1. His last dentist.
  2. His mother.
  3. A salesman.
  4. His friend.

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20.

  1. He works at night.
  2. He's changing jobs.
  3. He's a dentist.
  4. He only earns a little.

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W:Good morning. This is Dr. Allen's office.
M:Good morning, I'd like to make an appointment with Dr. Allen to have my teeth cleaned and checked. I'd like to have it done this week if possible.
W:I'll see whether the doctor has time to see you this week. Have you been to see Dr. Allen before?
M:No, I've just moved to town and Dr. Allen was recommended by a friend of mine. My name is Edward Johnson.
W:The doctor has no free time this week, Mr. Johnson. If you are having trouble with your teeth, I'll try to work you in. Otherwise, I can give you an appointment on Friday, the 22nd. Will that be all right?
M:I'm sorry. I'll be working on the 22nd. I'm not having any trouble with my teeth, but I had hoped to have the appointment this week, because I won't start work at my new job until next Monday.
W:How about Saturday, the 23rd, at 10 a.m.?
M:That will be fine. Thank you.
W:We'll see you on the 23rd then, Mr. Johnson. Good-bye.
M:Good-bye.