20. Mr. Black and Mr. White worked in the same bookstore. One day Mr. Black said to Mr. White, "I am going to have a small party at our house next Saturday evening. Will you and your wife come?"
Mr. White said, "Thank you very much. That is very kind of you. We are free that evening, thanks, but I will telephone my wife and ask her. After he telephoned, he looked surprised. "What is the matter?"said Mr. Black. "Did you speak to your wife?"
"No," answered Mr. White. "She wasn' t there. My small son answered the telephone. I said to him, 'Is your mother there, Peter?' And he answered, 'No, she is not at home.' ' Where is she then?' I asked. 'She is outside.' 'What is she doing?' 'She is looking for me.' "