To understand why the Earth is warming up.{#blank#}1{#/blank#}  (one) of all, we need to understand why it is warm. Our planet {#blank#}2{#/blank#} (cover) with atmosphere(大气）.Sunlight passes  {#blank#}3{#/blank#} (通过) the atmosphere and reaches the Earth. The Sun heats up the  {#blank#}4{#/blank#}  (Earth) surface. When the heat rises into the air, it is stopped by some special gases in the atmosphere like CO₂, the{#blank#}5{#/blank#}  (hot) returns to the Earth and keeps it{#blank#}6{#/blank#}  (warm) .

Power stations and cars release (释放) so {#blank#}7{#/blank#}  (much) greenhouse gases every day. So we can help stop global (全球的) warming by using less electric things such as{#blank#}8{#/blank#} (关掉) lights when we leave a room, or asking our parents to turn down the heating in our house{#blank#}9{#/blank#}  (save) energy. We can also stop global warming by finding other{#blank#}10{#/blank#}  (way) of transportation. For example, ride a bicycle or walk instead of going by car. Another way to help stop global warming is to plant and care for trees. Because trees take in CO₂, they are our best friends when fighting against global warming.

   Many teenagers have problems that worry them. Some do not learn their school subjects {#blank#}1{#/blank#} . Some are good learners and do well in exams, but are so poor at sports{#blank#}2{#/blank#}  their classmates call them “bookworms”. Many teenagers suffer from stress, The good news is that there are some simple {#blank#}3{#/blank#} to deal with stress..
   Firstly, eating a {#blank#}4{#/blank#}  diet, getting enough sleep and doing exercises are very important. How can we be happy if we are not{#blank#}5{#/blank#} ?
For school work, planning ahead can help. Making a list of things they need to do and planning{#blank#}6{#/blank#}  to do them can help students organize their time. If you are weak in a subject, you should {#blank#}7{#/blank#} more time on it and ask a teacher for help.
   Students should pay no attention to people who laugh at them {#blank#}8{#/blank#} , they should find the things they are good at.
   Students should also make enough time for their {#blank#}9{#/blank#}  . Playing sports, reading and{#blank#}10{#/blank#} films help them relax.

    It's Sunday morning. My grandparents, my parents, my cousin and I are at my home. We are all {#blank#}1{#/blank#}. What are my grandparents doing? Oh, my grandfather is exercising. He is playing {#blank#}2{#/blank#} two balls. My grandmother is reading a newspaper. She is reading a story in it. The story is {#blank#}3{#/blank#}. Look! How happy my grandmother is! And my father is watching TV. He is watching CCTV News. It's his favorite TV {#blank#}4{#/blank#}. My mother is in the kitchen. She is {#blank#}5{#/blank#}. She can cook nice food. She is a good mother. I love her very much. My cousin Peter is my uncle's {#blank#}6{#/blank#}. He is 10 years old. He is listening to music in my room. He likes music and he {#blank#}7{#/blank#} play the piano and the guitar. He is good at {#blank#}8{#/blank#}. He wants to be a singer(歌手). What am I doing? I'm {#blank#}9{#/blank#} the computer, but I'm not playing games. I'm {#blank#}10{#/blank#} an e-mail.

    Do you know Stephen Hawking? He's one of the most well-known{#blank#}1{#/blank#}（scientist）on space and time in the world. He was born in England in 1942. Hawking is {#blank#}2{#/blank#}（study）how the universe began and how it ends.

    When he studied math and science at Oxford University, he fell{#blank#}3{#/blank#}(serious) ill, which made him unable to speak or breathe. Till now, he can't move or feed{#blank#}4{#/blank#}(him). however, he has a wheelchair with {#blank#}5{#/blank#} special computer, with which he can communicate with others.

    {#blank#}6{#/blank#}he was facing all these difficulties, he refused to give up his hope of living. Because{#blank#}7{#/blank#} his illness, it was difficult for him to draw diagrams or to write. So he started{#blank#}8{#/blank#}(think) in pictures. With this new way of thinking, he is respected by people in the world.

    Once he{#blank#}9{#/blank#}(invite) to China to give lectures. His self-confidence and humorous conversations impressed us deeply.

    He once said, “When something unfair happens,{#blank#}10{#/blank#} is no need to worry about it! You just have to do the best in your own situation.”