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    When Gregor Mendel was teaching high school students, he noticed that plants had different traits (特征). For example, some pea plants were tall, w{#blank#}1{#/blank#} others were short. Mendel wondered why, so he decided to experiment.

    He c{#blank#}2{#/blank#} the seeds (种子) that were produced. He planted these new seeds and waited for the r{#blank#}3{#/blank#}. He wondered whether the new plants would be of medium h{#blank#}4{#/blank#}. But all the plants that grew from the seeds were tall.

    Mendel wanted to see what would h{#blank#}5{#/blank#} to the next generation (一代). He crossed the tall plants with each other in the same way he had experimented with the tall and short plants. When the n{#blank#}6{#/blank#} plants grew, three fourths of the plants were tall, and one fourth were short.

    Mendel found out that a plant r{#blank#}7{#/blank#} a message from each of its parents, and that message is carried by the plant's genes (基因). For example, a pea plant gets a gene for tallness or shortness from one or both of its parents. Mendel a{#blank#}8{#/blank#} found out that some genes were stronger than others. The gene for tallness was stronger than the gene for shortness. So a plant would be t{#blank#}9{#/blank#} if it had one gene for tallness and one gene for shortness. But if a plant had two genes for shortness, it would be short.

    Mendel had made a great d{#blank#}10{#/blank#}, but few understood it at that time. Mendel became famous only after his death.

    I was very quiet and shy before I became {#blank#}1{#/blank#} member of the Teen Board. At my first meeting, I remember that the Teen Board members really {#blank#}2{#/blank#} (encourage) me to speak, as I was quiet {#blank#}3{#/blank#}the whole meeting. It was then that I realized my opinion did matter and people wanted to hear my opinion. That really improved my confidence and self-worth.

    {#blank#}4{#/blank#} (Be) a member of the Teen Board has helped me develop my voice around my friends, and that's {#blank#}5{#/blank#} (especial) true at school. One day, I saw a student being bullied (恐吓) by a big boy. I came to the boy and asked him {#blank#}6{#/blank#} (stop). There's no doubt (无疑) that the confidence I had gotten from the Teen Board helped me stand up.

    I joined the Teen Board {#blank#}7{#/blank#} I knew that the teens on the board would be a good influence. I also thought that many of them had probably faced similar school situations and knew that they would be a good support system.

    {#blank#}8{#/blank#} to the Teen Board, I become a more positive person. I no {#blank#}9{#/blank#}feel sorry for myself. Now, I'm a self-confident girl. And I want to {#blank#}10{#/blank#} my experience with others.

    Do you have a pen friend? Do you still remember the time {#blank#}1{#/blank#}you began to write to each other? Are you still writing to each other now? Let's read a  {#blank#}2{#/blank#}of a pair of pen friends.

    Audrey Sims and Norma Frati are pen friends. Sims is from Australia, and Frati is from America. They {#blank#}3{#/blank#}to write to each other over 70 years ago, because their teachers {#blank#}4{#/blank#}them to write a letter as part of a pen friend program in school. They wrote more than 3,000 {#blank#}5{#/blank#}in the past years, {#blank#}6{#/blank#}Sims and her friend Frati had never met each other until 2013. Sims was 83 years old and Frati was 87. Last year Sims came to America to visit her old pen friend for the {#blank#}7{#/blank#}time.

    “I think we are {#blank#}8{#/blank#}to each other. We're both married and divorced(离婚)and married again, and it's almost the same,” said Sims. {#blank#}9{#/blank#}Sims and Frati love flowers and they planned to visit some gardens together in America. And the two women said that when Sims went back to {#blank#}10{#/blank#}, they would keep on writing.

    Some people think that they{#blank#}1{#/blank#}( get) ill if they use their brains（大脑）too much.  It is not true.  Through many researches, scientists{#blank#}2{#/blank#}( show) us that the more you use your brains, the better they{#blank#}3{#/blank#}( be), and the wiser you will become.

    Of course, if you want to keep your mind clear and be energetic（充满活力的）, you{#blank#}4{#/blank#}( take) a proper rest and study properly.  To the teenagers,{#blank#}5{#/blank#} ( use) their brains in the morning is good for their health.

    There are many ways {#blank#}6{#/blank#}( rest). One is a peaceful rest.  Sleep is a peaceful rest. Another is an active rest. For example{#blank#}7{#/blank#}( take) a walk outdoors, do morning exercises every day{#blank#}8{#/blank#}( change) the way of the brains' activities（活动）is also a good way to rest.In everyday life{#blank#}9{#/blank#}( eat) some eggs, meat, fresh vegetable and fruit is also good for the brains.{#blank#}10{#/blank#} (wish) you a wise man and a happy life.

    Our town is a great place to live in. It's the best place to enjoy my {#blank#}1{#/blank#} time.

    There are three movie {#blank#}2{#/blank#}. They are all good, but the one near my house is the {#blank#}3{#/blank#}.The most popular place for people to hang out is the Shopping Street, so it's really {#blank#}4{#/blank#}.

    {#blank#}5{#/blank#} is very convenient (便利的) in our town. There are many clothes stores and {#blank#}6{#/blank#} of them are trendy, but they are much {#blank#}7{#/blank#} than those in other cities. There are also a lot of video and music {#blank#}8{#/blank#}. They are very popular with students.

    Sometimes there are even street {#blank#}9{#/blank#}. Some students think they are boring, but I think they're quite {#blank#}10{#/blank#}. I want to be a street performer, too.