16.

  1. The man's college life.
  2. The woman's forgetfulness.
  3. The man's forgetfulness.
  4. The love story between the two speakers.

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17.

  1. On his face.
  2. In the bathroom.
  3. The woman had them.
  4. Above the mirror.

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18.

  1. His fishing pole.
  2. His pants.
  3. His wallet.
  4. His boat.

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19.

  1. Once he forgot to leave without his pants on.
  2. Once he forgot his wedding and went fishing instead.
  3. He forgot his wallet a hundred times.
  4. Once he forgot his sweetheart.

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20.

  1. Friends.
  2. Co-workers in a company.
  3. Brother and sister.
  4. Husband and wife.

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M:Have you seen my glasses? I can't find them anywhere.
W:Go in the bathroom and look in the mirror.
M:You mean I've got them on. How about that?
W:You are the most absent-minded person I have ever known.
M:I can't deny it. I'd lose my head if it weren't attached to my shoulders.
W:I'll never forget the time you went fishing and forgot to take your rod and reel.
M:I won't forget it either but that's not the most memorable example of my forgetfulness.
W:How about the time you started to leave without having any pants on?
M:No, that's not it.
W:It couldn't be forgetting your wallet. You have done that a hundred times. I'm tired of guessing, tell me.
M:You never would have guessed. I don't believe I've ever told you about it though you were indirectly affected by the incident. I almost married my college sweetheart.
W:You are right. You have never told me about her.
M:Well, anyway, the day we were supposed to get married was such a beautiful day that I forgot all about the wedding and went fishing instead. The girl never forgave me.
W:I hardly blame her though I'm glad things turned out differently.