Mr. Smith was walking on the street. A good-looking young woman met him and said, "Good morning". But Mr. Smith couldn’t remember who she was. He didn’t know her. He was much surprised (惊讶) and didn’t know what to say.
Then the man knew that she had made a mistake (错误) because it was very dark. So she said, "Oh, I’m sorry. When I first saw you, I thought you were the father of two of my children."
This time Mr. Smith was more surprised. He stared at (目瞪口呆地看) her when she walked on. The woman didn’t realize (意识到) that Mr. Smith didn’t know she was a school teacher. Mr. Smith was more surprised because ______.