It was a very foggy day in London. Mr. Smith had arrived from Edinburgh to go to a very important meeting, but no buses or taxis were running because the drivers were not able to see more than a yard in front of them. It was still early for his meeting, so he thought that he would walk to the office. But he saw that nobody was even trying to walk anywhere.

While he was standing there, saying unhappy things about the fog, and thinking that he would have to telephone to the office and say that he was not able to come, a young man came up to him and said, “Sir, if you want to go somewhere, I can guide you.”

Mr. Smith was very surprised and could hardly believe his ears. He asked, “How can you find the way when there is thick fog everywhere?”

“Don’t worry, sir,” answered the young man. “Believe me.” So Mr Smith told the young man where he wanted to go, and they started. They walked quite fast, turning corners and crossing roads in different places.

At last, Mr. Smith thought, “Perhaps this man is foolish, he would show me a wrong place.” But a minute later, the young man stopped and said, “Here is the place, sir.” Mr. Smith was surprised to find that he had really reached the office. He gave the young man a pound and then said, “How did you find the way in the fog?” “I am blind, sir,” answered the young man, “but I know London well, and it is exactly the same for me in the fog.”

When someone asks me what business I am in, my face ______ hot. I envy (嫉妒) people who can say that they are writers, book-keepers and doctors. ______ of these jobs speak for themselves.

I really do make a living by ______, and a good one, too. I can laugh ______ a king, a school boy, a bus driver or a shopkeeper. I laugh sadly, kindly and happily.

I need hardly point out that a job of this kind is tiring. I ______ most evenings in night-clubs. My job is ______ during the weaker part of the show.

I can copy the laughter of others. I can laugh in many different ways. But I’m not sure that I have ever heard the sound of my own laughter.