16.

  1. Because he has pneumonia.
  2. Because his wife told him to.
  3. Because he feels tired.
  4. Because his wife feels tired.

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17.

  1. A couple of days.
  2. Four years.
  3. Six months.
  4. Two weeks.

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18.

  1. When the doctor told him to.
  2. When his wife told him to.
  3. When he had to.
  4. When he felt better.

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19.

  1. Pneumonia.
  2. His job.
  3. Tests in the hospital.
  4. His wife.

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20.

  1. Pneumonia four years ago.
  2. A minor operation last year.
  3. Insomnia
  4. Common colds.

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M:Dr. Brook, I just don't know what's wrong with me. I always feel tired and rundown. My wife finally persuaded me to visit you to find out what the trouble is.
W:Looking at your case history I see that you had pneumonia four years ago and that you also had a minor operation last year. Did you have any long aftereffects?
M:Well, I don't remember so ...
W:For instance, how long did you stay at home each time?
M:Just a couple of days. But about six months ago I was home for about two weeks with a cold or something.
W:Did you see a doctor at that time or did you just stay home?
M:No, I didn't see a doctor. The symptoms were about the same as this time. When I began to feel better, I returned to work.
W:And when did you start feeling so tired again?
M:It must have been about ten days ago. When I came home from work one night, there just didn't seem to be any reason to go back the next day.
W:Well, it sounds as if your problem may be the kind of work you do. The tests I just made don't show anything really wrong. But I would like to make some further tests in the hospital.
M:That's fine with me.
W:All right, you can check in tonight and I'll make the tests tomorrow morning.