How will our continuously growing population affect our way of life, our environment, even our planet? No matter how you look at it, we will face {#blank#}1{#/blank#}extremely serious problem. By the middle of the 21^st century, we {#blank#}2{#/blank#}(use) up all the oil that drives our cars if at the rate we're going. Even if scientists develop some new {#blank#}3{#/blank#}(way)of feeding the human race, the crowded conditions on the earth will make {#blank#}4{#/blank#}necessary for us to look for open space somewhere else. But none of the planets in our solar system are able  {#blank#}5{#/blank#}(support) life at present. One possible solution {#blank#}6{#/blank#}the problem, however, has recently been suggested by an American scientist, Professor Carl Sagan. His idea is {#blank#}7{#/blank#}before the earth's resources are almost exhausted, it will be  {#blank#}8{#/blank#}(total)possible to change the atmosphere of Venus（金星）and so create a new world almost as large as earth itself.

    However, {#blank#}9{#/blank#} his idea is turned into reality, humans have a long way to go. On the one hand, Venus is much {#blank#}10{#/blank#}(hot)than the earth; on the other hand, there is only a tiny amount of water there.

    Everyone has a childhood and childhood experiences are often very{#blank#}1{#/blank#}(interest).Children often make us laugh.

    I often remember my childhood,the years{#blank#}2{#/blank#}many funny things happened.When I was two-year-old child,both my parents were always very busy{#blank#}3{#/blank#}their work.My mother worked as{#blank#}4{#/blank#}sales manager in a company while my father served in the army.So I{#blank#}5{#/blank#}(live) with my grandma in a village.I was always waiting for my parents at home. Once my father sent{#blank#}6{#/blank#}(we) a photo of his in soldier's uniform,which{#blank#}7{#/blank#}(post) on the table reminding me of him.

    Once my mother came to see me and we were{#blank#}8{#/blank#}(go) to the downtown together.On the way we saw a group of{#blank#}9{#/blank#}(soldier).And when I saw them,I became very excited.I shouted in a loud voice,"This is my father,that one is my father,and he is my father,too..."

    {#blank#}10{#/blank#} (hear) this,my mother laughed and said she would remember that moment all her life.

    Tyler Thompson is{#blank#}1{#/blank#}unlikely star in the world of Peking opera. The 15-year-old from Oakland has fascinated audiences in the U.S. and China with his ability{#blank#}2{#/blank#}(sing) pitch-perfect Mandarin(普通话) and perform the ancient Chinese art form. The teen,{#blank#}3{#/blank#}is black and only speaks some basic Chinese, has been praised by teachers since he{#blank#}4{#/blank#}(pick) up the music as a kindergartner. “As soon as he opens{#blank#}5{#/blank#}(he) mouth and sings in Chinese, the Chinese are very surprised and they feel very proud of him,” said his music teacher. “When he puts on the costume, and all the acting, you can see that he is pretty good.”

    Tyler has learned to sing several well-known pieces of Peking opera, a centuries-old form of musical theater{#blank#}6{#/blank#}(know) for its highly structured costumes, changing gongs(锣) and cymbals(钹), wide-ranging voices and highly stylized{#blank#}7{#/blank#}(move). Tyler got{#blank#}8{#/blank#}(stand) cheers when he performed{#blank#}9{#/blank#}Justice Bao, a famous Song Dynasty judge who fought corruption, from the Chinese classic Bao Qing Tian. “The music is very beautiful, and it's very passionate,” said Tyler, “It's made me want to know{#blank#}10{#/blank#}(much) about the world outside of America or California or Oakland.”

    Barbara Jordan was a lawyer, educator and member of Congress. As a politician, Barbara Jordan worked for social change. She {#blank#}1{#/blank#} (seek) to make a difference for all Americans using her {#blank#}2{#/blank#} (politics) influence.

    Barbara Jordan became the first African-American woman {#blank#}3{#/blank#} (elect) to the United States Congress to represent Texas. {#blank#}4{#/blank#} helped Barbara gain her national {#blank#}5{#/blank#} (recognize) was that she became a member of the congressional committee investigating President Richard Nixon in 1974.

    Barbara Jordan was born in the southern city of Houston, Texas in 1936. She was {#blank#}6{#/blank#} (young) of the three daughters in her family. Her father was a Baptist minister. When she was a child, Barbara's parents pushed her to succeed. Barbara Jordan said her parents would criticize her for not {#blank#}7{#/blank#} (speak) correct English. They urged her to become a music teacher, because they said that was the only good job for a black woman at that time. Her sisters did become {#blank#}8{#/blank#} (teacher). Barbara Jordan, however, explained later that she wanted to do something unusual.

    At first she thought about being a pharmacist, {#blank#}9{#/blank#} scientist who is an expert in medicines. After she became the first African-American state senator(参议员), her career in politics took {#blank#}10{#/blank#}.

    Discovering yourself plays {#blank#}1{#/blank#} important role in inspiring your confidence. By doing so, you could know {#blank#}2{#/blank#} you are weak in. And you may also realize you're quite a great person with great strengths. So when you're in a hard situation, you will believe in {#blank#}3{#/blank#} (you) and spend the most difficult time with confidence. Otherwise you may give up and then lose everything. Therefore, the ability {#blank#}4{#/blank#} (trust) yourself will decide your future a lot.