—John.

    Chuck Wall teaches management and human relations at Bakersfield College.He walked into class one day and told his students that their homework was to perform{#blank#}1{#/blank#}simple and random act of kindness.Not{#blank#}2{#/blank#}(understand) the homework,the students didn't know what to do.Chuck didn't answer their questions.Instead,he encouraged his students to work it out by themselves.

    One week later the students entered.the classroom and began sharing their stories{#blank#}3{#/blank#}(excite).One reported on helping a poor dog abandoned by its owner.Another student told others about giving blankets{#blank#}4{#/blank#}to the homeless. Gradually,more and more students developed the habit of doing such kind acts,from{#blank#}5{#/blank#}they benefited a lot.

    Since then,similar kind acts{#blank#}6{#/blank#}(perform) in schools around the world.Many schools organize a.Random Acts of Kindness Week,around November 13^th,celebrated World Kindness Day.Some schools use each day of Random Acts of Kindness Week to perform such a different kind act{#blank#}7{#/blank#}making a new friend,helping someone,doing community{#blank#}8{#/blank#}(serve) or raising money for a charity.In this way,students learn to consider other people and think about{#blank#}9{#/blank#}small actions can make the world a{#blank#}10{#/blank#}(good) place.

    One day Mary was busy working in her office in London {#blank#}1{#/blank#} she received an E-mail from her friend Joan. In Joan's e-mail, she persuaded Mary {#blank#}2{#/blank#}( look) for a flat in London for her. As she had{#blank#}3{#/blank#} (little) money at her command than before, the flat had to be cheap, but it had to be modern, with elevators and gas lines. It had to be in the{#blank#}4{#/blank#} (east) part of London, with petrol and subway stations nearby. Though Mary found it difficult to find such a flat, she still went {#blank#}5{#/blank#}(care) from one block(街区) to another, looking for a flat {#blank#}6{#/blank#}would meet（满足） Joan's requirements. Having tried too many times, Mary met her boss and politely asked him {#blank#}7{#/blank#}advice. It was the first time that she{#blank#}8{#/blank#} (talk) with his boss about her personal problems. It happened that the boss just had such a flat for rent, so they quickly reached {#blank#}9{#/blank#}agreement(协议). But to her surprise, when she e-mailed Joan, telling her the good news, Joan said that she had changed{#blank#}10{#/blank#}(she) mind—she was not returning to London.

    Climate change has caused a rise in sea levels. This has increased the amount of salt in fresh water{#blank#}1{#/blank#}(use) on coastal farms. As{#blank#}2{#/blank#} result, farmers are {#blank#}3{#/blank#}(gradual) unable to use fields close to the sea.

    However, Marc Van Rijsselberg, a farmer in the Netherlands is now using a{#blank#}4{#/blank#}(mix) of sea and fresh water {#blank#}5{#/blank#}(grow) healthy and tasty vegetables.

    He teamed up with scientists from the Free University and divided a farm {#blank#}6{#/blank#}eight negated areas. Separate pipes pumped fresh and sea water, and a computer program created water with eight levels of salinity（含盐度）．

    The water levels and the levels of salinity were controlled by computerized measuring devices called "sensors". Mr. Van Rijsselberg said he was able to harvest vegetables from most of the eight testing areas. He said the vegetables were smaller than {#blank#}7{#/blank#}grown in fresh water. But he said they also had more sugar and salt, so they tasted much{#blank#}8{#/blank#}(good).

    He found that potatoes grew better than the other vegetables in the combination of sea and fresh water. Mr. Van Rijsselberg said four kinds of these potatoes would be sent to Pakistan{#blank#}9{#/blank#}thousands of hectares of land {#blank#}10{#/blank#}(damage) by salinization (盐化作用) last year.

    The choices people make can cause cancer. Not everyone who {#blank#}1{#/blank#} (use) tobacco products will get cancer, but the chance of getting certain{#blank#}2{#/blank#}(type) of cancer increases with tobacco use. The recent research{#blank#}3{#/blank#} (show) us that the constant misuse or overuse of alcohol may cause cancer of the mouth and throat as well recently.

    Sometimes cancer can be caused by radiation{#blank#}4{#/blank#} (find) in sunlight and X-rays, in addition {#blank#}5{#/blank#}other places. This doesn't mean you should stop getting X-rays or stay indoors, but limiting your{#blank#}6{#/blank#} (expose) to radiation can reduce the chances of developing cancer. The X-rays you get at{#blank#}7{#/blank#} doctor's or dentist's office are not {#blank#}8{#/blank#}(typical) enough to cause cancer.

    And sometimes, the reason{#blank#}9{#/blank#} someone gets cancer is simply an unfortunate mystery. Some cells in the body may start to increase and change. Doctors and researchers can see it happening{#blank#}10{#/blank#}they cannot provide a description of why it started.

    No one thought that young Albert Einstein would grow up to change the world. He was so slow in learning to speak that he was considered a bit {#blank#}1{#/blank#}(fool).

    Albert Einstein was never happy in school. He answered slowly because he was very thoughtful, and he asked difficult questions, which made {#blank#}2{#/blank#}(he) teachers think that he was trying {#blank#}3{#/blank#}(make) trouble. The strict discipline（纪律）of a German school made him very unhappy.

    However, young Einstein {#blank#}4{#/blank#}(do) learn what interested him, and he was interested in what lay below the surface of {#blank#}5{#/blank#}(thing). For instance, his father once gave him a compass（指南针）. This made Albert curious {#blank#}6{#/blank#} the unseen forces that could keep a compass needle always pointing north. In his teens he read deep in science. He had already started to wonder about the mysteries of {#blank#}7{#/blank#} universe.

    At 17, Einstein entered the Polytechnic Institute in Zurich, Switzerland, {#blank#}8{#/blank#} he studied mathematics and physics. He stayed away from many lectures and did not impress his professors, but he was {#blank#}9{#/blank#} (actual) studying very hard all the time. When he graduated in 1900, he asked to be appointed as an assistant in the physics department but {#blank#}10{#/blank#}(refuse).