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    Two years ago, a 9-year-old girl from Massachusetts, US, wrote a letter to American President Barack Obama. "Why aren't there any women on the dollars or coins of the United States?" Sofia asked. "There are many women that could be on the dollars or coins because of the important things they've done." To her surprise on April 20, also her 11th birthday, Sofia got a call from the White House telling her that her wish will come true.

    Harriet Tubman, an African-American woman, will be on the face of the $20 bill, and the final design will be released(发布) by 2020, said US Treasury Secretary Jacob Lew. This means that Tubman will become the first woman in more than a century and the first black person to appear on the country's currency (货币).

    Tubman was born a slave (奴隶) in 1822. When she was 27, she made her escape. But Tubman wanted to help other slaves become free, so she later returned to the South 19 times and saved more than 300 people. She fought against slavery all her life.

    However, while Tubman is going on the new currency, women still bring home far fewer $20 bills than their men colleagues (同事). According to the Institute for Women's Policy Research, women are paid only 79 percent of what men are paid in the US.

    "Women have long been undervalued (低估)," said Susan Ades Stone from the US. "To put a great woman on the currency can remind us every day of women's value, abilities and contributions. At least it's a step in the right direction.

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    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.

    Steven is six years old. He gets some money from his mother every week. He buys a lot of things from the shops, but he doesn't really need them, and he puts them everywhere. One day his mother gives him a notebook and says, “Now, Steven, when you buy things, write their names down in the notebook, and also write down how much they are. Then you can look at it again when your money is all gone (花光了), and you don't waste (浪费) so much money next time.”

    After a week, Steven says to his mother, “Do you know, Mum, before I spend any money now, I really stop and think!” His mother is very happy and thinks, “Well, my son knows the value (价值) of money now.” But then she hears him say, “Mum, before I buy something, I always ask myself, 'Can I spell (拼写) that word and put it down in my notebook?' ”

    At midnight Mr. King coughed again. He got up and took some medicine. Before he lay down again, he smoked. And he couldn't go to sleep any longer. He found the medicine book and began to read it. He was afraid he had lung(肺) cancer (癌). He seemed to see death was waiting for him. Tears(眼泪) ran down his face. He didn't see his wife was standing by him.

    “What's wrong with you, dear?” asked the woman.

    “Nothing,” the old man answered and covered his face with his hands.

    The old woman opened the book and understood at once. She said, “You must stop smoking right now.”

    “I began to smoke when I was nine, you know. How can't I do that?”

    “But I think health is more important.”

    Mr. King coughed again and his wife said, “Go to see a doctor tomorrow. He will be able to help you, I think.”

    The doctor told Mr. King to have an Xray examination(检查) of his lungs. And then he looked at the Xray carefully for a long time.

    “Tell me the truth, doctor.” said Mr.King, “Do you see any shadows(阴影)in my lungs?”

    “No, I don't see anything.”

    “Yes?” the old man said happily. “Really?”

    “Yes. Your lungs are turning black. How can I see any shadows?”

    Roger, a young man from China, has taught Chinese in a primary school in England for 3 years. A lot of children like his class and he enjoys teaching them very much. All the pupils are quite interested in what Roger teaches them. They learn quickly and do everything carefully.

    One day he said to the children, “People in a lot of Asian countries wear white clothes at funerals (葬礼), but people in America and in Europe wear white in the weddings because white means purity and happiness. What colour does an English woman wear when she gets married?”

    Mary said, “White, sir, because she is happy.” “That is good, Mary,” Roger said. “You are quite right. She wears white because she is happy.”

    But then one boy in the class put up his hand. “Yes, Dick?” Roger said, “Do you have a question?” “Yes,” Dick said. “Why do men wear black in our country when they get married, sir?”