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      Mark Twain was a great writer in America. He wrote many books. He liked telling jokes in his books. People liked reading them very much. And it was full of jokes in his life, too. Mark Twain liked reading. So he often borrowed books from other people. One day, he wanted to borrow a book from his neighbor. His neighbor was a mean man. He didn't want to lend it to Mark Twain. Then he had an idea. He said to Mark Twain, “I have a rule. You will have to read the book at my home. If you want to borrow it from me, you should never take it out." Mark Twain had to read that book at his neighbor's house.

     A month later, his neighbor went to borrow a cropper (割草机) from Mark Twain. Mark Twain said to him with a smile, "I make a rule, too. That is, you must use my cropper in my garden. If you borrow it, you can never take it out either."

    Money makes the world go round. But money isn't anything when people don't know how to use it. And no one is better at using money than American investor（投资者）Warren Buffet. He is one of the richest men in the world.

    Buffet was born in Nebraska in the US in 1930. As a child, he loved making and saving money. He used to go door-to-door selling his own products（产品）.

    After university, Buffet went on buying and selling shares（股票）. Shares are small part of a company. He is good at predicting changes in companies. By 1962, he became a rich man. In 1990, he went one step further and became a billionaire（亿万富翁）.

    In 2008, Warren Buffet became the richest man in the world. He has promised to give 99% of his wealth to charity（慈善）after he dies.

    Mark Twain, as you know, was famous in his day as a public speaker. In his public speeches he always tell funny stories. He also liked to listen to funny stories and to play jokes on his friends. One day one of his friends lost his wallet and asked Mark Twain to pay his train fare for him. "But I don't have enough money to pay both your fare and mine, "Mark Twain said. The friend didn't know what to do. "We can do this, "said Mark Twain." We can get on the train and when the conductor comes to check the tickets, you can hide under my seat." Later, however, when the conductor came to check the tickets, Mark Twain gave him two tickets, one for his friend and one for himself. Then he explained in a loud voice, "My friend is a strange man. When he travels on a train, he doesn't like to sit on the seat." Of course everybody in the train looked at the poor friend and laughed at him loudly.

    One day, John read an advertisement in a newspaper. It said "Wanted. The best salesman in the world." John thought he was a great salesman and went to ask for the job. "I'm the best salesman in the world," he said to the manager. "Give me the job."

   "You must prove you're the best," the manager said.

   "OK I will," John said.

   "Good." The manager took several boxes of sweets out of his desk." Last week I bought a thousand boxes of sweets. If yon can sell them all before the end of the week, yon can have the job," said the manager.

   "That's easy," John said. He took the boxes of sweets and left the office.

    Every day and all day he went from shop to shop, trying to sell the sweets. But he couldn't sell one. The sweets were too bad for him to sell. At the end of the week he went back to the manager." I'm sorry, sir," he said," I was wrong about myself. I'm not the best salesman in the world, but I know who is."

   "Oh" said the manager. "Who?"

   "The person who sold you a thousand boxes of the sweets."