阅读下面短文，从每题所给的A、B、C、D四个选项中，选出能正确回答所提问题或完成所给句子的最佳答案。

     Sixteen years ago, a boy gave me an important gift. It was a smile.

      It was the early autumn of my first year at a middle school, and my old school was far away. As a result, no one knew who I was. I was very lonely, and afraid to make friends with anyone.

     Every time I heard the other students talking and laughing, I felt my heart break. I couldn't talk with anyone about my problems.

Then one day, my classmates were talking happily with their friends, but I was sitting at my desk unhappily as usual.  At that moment, a boy entered the classroom. I didn't know who he was. He passed me and then turned back. He looked at me, with a smile.

    Suddenly, I felt the touch of something bright and friendly. It made me feel happy and warm. That smile changed my life. I started to talk with other students and made friends. Day by day, I became closer to everyone in my class. The boy with the lucky smile has become my best friend now.

    One day I asked him why he had smiled, but he couldn't remember doing so!

     It doesn't matter because all the dark days have gone. I believe that the world is what you think it is. If you think it is lonely, you might always be alone. So smile at the world and it will smile back.

    Alan, a boy from India went to study in the UK two years ago. He found a part-time job in a restaurant. Many British students also worked there. Their job was washing the dishes. It was an easy job, but the boss said, "You must wash every dish seven times." At first, Alan was careful. The boss was happy with him. After one month, he found that the boss didn't check very often. He thought there was no difference between five times and seven times. So he just washed five times. He worked very fast. The boss was even happier. One day, a British student asked him why he could wash so fast. Alan told him the secret. The British student was surprised but didn't say anything. A few days later he told the boss about it. The boss fired (解雇) Alan.

    Alan went to other restaurants, but all of them said, "Go away! You are not honest. We don't need you." Alan was sad because he could do nothing.

    This was the first real task I received in my new school. It seemed simple: go on the Internet and find information about a man named George Washington. As I searched the name, I found that there were two famous people having the same name who looked completely different! One invented hundreds of uses for peanuts（花生）, while the other led some sort of army across America. I stared at the screen, wondering which one my teacher meant. I called my grandfather for a golden piece of advice: let the coin decide. I flipped(掷) a coin and Ah! Tails (背面)! My report would be about the great man who invented peanut butter, George Washington Carver.

    Weeks later, I stood in front of the classroom and proudly read my homework. But things started to get strange. I looked around the room, only to find my classmates with big smiles on their faces and tears in their eyes and my stone-faced teacher. I was completely lost. “What could be causing everyone to act this way?”

    Oh well, I dropped the paper and sat down at my desk, burning to find out what I had done wrong. As a classmate began his report, it all became clear, “My report is on George Washington, the man who started the American War of Independence.” The whole world became quiet! How could I know that my teacher meant that George Washington?

    Of course, my subject result was awful. Sad but fearless, I decided to turn this around. I talked to the headmaster Miss Lancelot, but she said firmly(坚决地): No re-dos; no new score. I felt that it was not fair, and I believed I should have a second chance. So I threw myself heartily into my work for the rest of the school year. Ten months later, I sat in the headmaster's office again, but this time a completely different conversation. I smiled and flashed back to the terrible moment at the beginning of the year when the headmaster told me I was good enough to skip(跳过) the 6th grade and started the 7th grade next term.

    A 50-year-old American officer(官员)came back to his school. The teacher asked him to give a talk to the small boys and girls there. The talk was about the love of their great country. All the little ones were sitting in a large meeting-room. The old officer went up and began speaking. He said, "Boys and girls, I studied in the school forty years ago. When l was your age, we were not as happy as you are today. Think about it and answer me, why are you so happy now?"

    No sound came from the children. The old marl waited for a long time. Then a short boy in the front put up his small dirty hand. "Good boy! Please answer me, dear, "said the officer.

    With a big smile on his face, the boy stood up and said. "If you speak long enough, we won't have math and biology(生物)lessons this morning."

    One day, I was waiting for my friend at the bus station. A man came to sell1and I just smiled and said thank you. I didn't know if it was because of my smile, the young man came closer and stood2me and started talking to me. "You know, I wasn't born like this, selling shoes. I had a family, but one day my life just3upside down and all was gone," he said. He told me that his wife took away all his money, sold his car and the house. It was really a hard time for him and he was4at that time. He had nothing and then5to sell shoes to make a living. I stood next to him and listened, but I was still6how someone could be so open to a total stranger like that. Then I realized that some people get7in that way. We often meet people with troubles in their hearts. For some of them, there isn't anybody to listen to them,8I've learned to be kind to them. I always spare my time to listen to them. By doing this, the one9listens can not only help others but also himself, because he gets to learn something from what others10and see other sides of life. This will make the world a better place to live in for all of us.