Mr. Smith is walking on the street. A good-tooking young woman meets him and says. "Good evening. ’ But Mr. Smith can’t remember (记起) who she is. lie doesn’t know her. He is much surprised (惊讶) and doesn’t know what to say. Then the woman knows that she made a mistake (出错) because it is very dark (天黑). So she says. "Oh. I’m sorry. When 1 first see you. I think you are tile father of two of my children. ’ Tiffs time Mr. Smith is more surprised. He slares al (目瞪口呆地看) her when she walks on. The woman doesn’t realized (意识到) that Mr. Sadth doesn’t know she is a school teacher.

The woman makes a mislake beceause ______