I'd like to tell you a story about my best friend Jane. Last week in school we had a big fight, and she didn't {#blank#}1{#/blank#} me. It all started when she asked me if she could copy my homework. I asked her why she wanted to do that, and she said that she had forgotten to do hers. I said I didn't think it was a good idea. I said it would start a bad{#blank#}2{#/blank#} and she should do her own work. She got really {#blank#}3{#/blank#} at me and said she didn't want to be my best friend anymore. I said that was OK and that I was sure she would {#blank#}4{#/blank#} it. And she did. Yesterday she told me she was {#blank#}5{#/blank#}. She said it was much better if she did her own work.

    My classmates talked about the winter camp. Everyone was happy except (除……之外) me. I didn't {#blank#}1{#/blank#}to go skiing (滑雪) at all. I wanted to stay at home but my parents asked me to go.

    When arriving at the camp our coach (教练) asked us to ski I thought I skied {#blank#}2{#/blank#}

than others but I still didn't do a good job. Ha, Ha! behind me，someone started {#blank#}3{#/blank#}

 I looked back {#blank#}4{#/blank#}who was laughing at me. To my surprise, I saw a girl. She did as {#blank#}5{#/blank#}as me. "I thought I'd be bad at this, but it seems {#blank#}6{#/blank#}than I expected!" she said.

    The next day I didn't want {#blank#}7{#/blank#} skiing. But my coach chose me to be the first one to ski down the slope (斜坡).This time I {#blank#}8{#/blank#}I was flying and it was wonderful. After that I wasn't afraid anymore. And I didn't {#blank#}9{#/blank#}what other people thought of me. That day my coach said I skied the most beautifully of all.

    From this I learned that we should try our best {#blank#}10{#/blank#}every challenge (挑战).

A Cloud of Hope and Danger

    In 2050, a small cloud floats through the air in a hospital operating room (手术室). In the room a patient, suffering from cancer, lies on a table. The cloud surrounds (包围) the patient, {#blank#}1{#/blank#} her body and filling her lungs (肺). The cloud is not smoke or steam. It is made of millions of microscopic robots {#blank#}2{#/blank#} nano-robots (纳米机器人). These tiny robots move from cell (细胞) to cell in the patients' body, destroying the cancer cells.

    Fighting cancer with nano-robots is only an idea today, {#blank#}3{#/blank#} scientists say that it would be possible in the future. Using nano-robots for good purposes such as fighting disease or repairing the environment may be the {#blank#}4{#/blank#} to many of today's problems.

    However, nano-robots could be a {#blank#}5{#/blank#} risk as well. Since nano-robots are so tiny, they will have to work in large teams of many thousands to 'many millions. {#blank#}6{#/blank#} this reason, nano robots will have to be programmed to build {#blank#}7{#/blank#}. Scientists will not have the ability to build millions of nano-robots one by one.

    This ability to reproduce (复制) is making some scientists worried. What if something goes wrong in the programming? Quite a lot of crazy nan-orobots would be far {#blank#}8{#/blank#} than any disease. Some people think that if they get out of control, nan-orobots could destroy the Earth.

    What should be done? Should we continue {#blank#}9{#/blank#} nan-orobots or should we search for other methods? This is one of the many difficult {#blank#}10{#/blank#} that we have to make in the future.