If the population of the Earth keeps on increasing at its present rate, there will eventually not be enough resources {#blank#}1{#/blank#} (leave) to support life on the planet. By the middle of the 26^th century, if present trends continue, we {#blank#}2{#/blank#}（use）up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on the earth will make{#blank#}3{#/blank#} necessary for us to look for open space somewhere else. But {#blank#}4{#/blank#} of the other planets in our solar system are capable of supporting life at present. One possible solution {#blank#}5{#/blank#} the problem, {#blank#}6{#/blank#}, has recently been suggested by an American scientist, Professor Carl Sagan. Sagan believes {#blank#}7{#/blank#} before the Earth's resources are {#blank#}8{#/blank#} (complete) exhausted it will be possible to change the atmosphere of Venus and therefore create a new world almost as large as the Earth {#blank#}9{#/blank#}.The difficulty is that Venus is much hotter than the Earth. {#blank#}10{#/blank#}, there is only a tiny amount of water there.

    When I left for the United States to study. I had butterflies in my stomach. I was nervous because I was going to {#blank#}1{#/blank#} new place with new people and new customs. I couldn't even understand {#blank#}2{#/blank#}(they)language. Everything was different {#blank#}3{#/blank#} my own country. There was nobody that I could talk to. I just had my husband, {#blank#}4{#/blank#} was a new person for me, too.

    It was a sad moment when I had to say goodbye to my family and friends. I didn't want {#blank#}5{#/blank#}(leave)my hometown because I {#blank#}6{#/blank#}(grow) up there and had wonderful {#blank#}7{#/blank#}(memory) of the place. So, {#blank#}8{#/blank#} (think)about all these changes made me nervous and I was {#blank#}9{#/blank#}(worry)about my new life. But studying abroad was a decision that I made myself. I had to continue and accept the challenge. I looked forward to {#blank#}10{#/blank#}(visit)my family in the summer vacation.

    Millions of people in cities across Asia are using phone apps to borrow bicycles for local travel. This kind of technology is made for people who want to leave {#blank#}1{#/blank#} (car) and motorcycles at home, and avoid {#blank#}2{#/blank#} (spend) money on a taxi service.

    As {#blank#}3{#/blank#} (report) on TV, bicycle sharing has been rising in popular places like Beijing and Singapore. The two-year bike-sharing trend（趋势）has put over 16 million bikes in China alone, {#blank#}4{#/blank#} has cut car use and demand for gas. “I often use bike-sharing service because it's very {#blank#}5{#/blank#} (use),” said Wei Zhang, who uses a shared bike several times a week {#blank#}6{#/blank#} (go) to work.

    “Bike-sharing {#blank#}7{#/blank#} (be) crazy since late last year,” said Harry Liu, who works as an advisor for HIS Market. He added that more people are using public transport {#blank#}8{#/blank#} the reason that they can finish their trip with a shared bike.

    Last month, {#blank#}9{#/blank#} Chinese bike-sharing start-up company opened offices in Kuala Lumper, Bangkok and Washington D. C. The company, {#blank#}10{#/blank#} (found) in April 2016, is called Mobike. Another Chinese company, ofo, provides a similar service.

    The university I attend has about 3500 students. One early afternoon, I {#blank#}1{#/blank#} (walk) around the campus when I found a female student sitting on the walkway with tears on her face. Everyone just walked by her, so I decided to stop {#blank#}2{#/blank#} (give) her a hand. I dropped my books and sat down beside her. {#blank#}3{#/blank#} turned out that she injured her ankle (脚踝) and was {#blank#}4{#/blank#} (able) to walk. So I told her that I would sit with her {#blank#}5{#/blank#} she was ready to get up. It only took a few minutes for her to calm down. Then I took her {#blank#}6{#/blank#}the hand and got her to the nearest hospital.

    She thanked me so much for just stopping! Since then, when we run into each other {#blank#}7{#/blank#} (occasional) on campus, she would smile and thank me again. And we have become good friends now. I am amazed that just my sitting there, {#blank#}8{#/blank#} (offer) support and comfort to a total {#blank#}9{#/blank#} (strange) would affect her so greatly. She said she was grateful for what I had done, {#blank#}10{#/blank#} made her feel that she was not alone in the world.

    Today, it is not rare that people may lose their jobs, so it is perhaps the time to consider the experience of unemployment. What are the first feelings? Well, {#blank#}1{#/blank#} (lose)a job, or not being able to find one, almost always causes sadness.

    If you've lost a job, the first feeling is often that of{#blank#}2{#/blank#}(disappoint)  The days seem{#blank#}3{#/blank#}(be)getting longer and the time becomes {#blank#}4{#/blank#}(hard)to fill in. Some people may {#blank#}5{#/blank#}(have)difficulty in sleeping and eating. They feel depressed, often isolated and lonely. Others may lose confidence in themselves. They are no longer certain about {#blank#}6{#/blank#}(they)own feelings. Despite all these problems, unemployment may bring good feelings, too. It's nice to be able to lie in bed in the morning, spend more time{#blank#}7{#/blank#}your family and relatives, and have more time to think. It can be a chance for a fresh start. You can use the time to consider{#blank#}8{#/blank#} you really want to get from life and how you can get it. Also you can use the time to plan how to find {#blank#}9{#/blank#} new job, learn a new skill, or see if you can run your own business and become a success. {#blank#}10{#/blank#}(possible), a new and better job is already waiting for you.

    Do you live in a city? You've probably noticed how noisy and crowded life in a city can be. {#blank#}1{#/blank#} if you could live next to a calm lake instead?

    As it turns out, {#blank#}2{#/blank#} (live) near bodies of water – lakes, rivers, ponds, even oceans – can help us feel both happier and healthier. Those who live less than a kilometer from the coast are around 22 percent less likely {#blank#}3{#/blank#} (have) mental health problems than those who live 50 kilometers or more away, according to a study by researchers from the University of Exeter, UK. People who visit the coast at least twice a week tend to experience {#blank#}4{#/blank#} (good) general and mental health as well.

    So how does "blue space" make us feel better? For one thing, aquatic environments tend to have less pollution and more sunlight, both of {#blank#}5{#/blank#} linked to better mental and physical health. People who get more sun tend to be happier than those who do not.

    There's also the air above {#blank#}6{#/blank#} sea. After spending time near the ocean, you might find that you feel more relaxed than usual. This is {#blank#}7{#/blank#} sea air is charged with negative ions (负离子). These ions balance our levels of serotonin (血清素), a chemical that affects our moods. With {#blank#}8{#/blank#} (balance) serotonin levels, we feel more calm and relaxed, according to Daily Mail.

    Finally, people who live near water tend to be more {#blank#}9{#/blank#} (physical) active, according to the Guardian. Water sports like swimming and rowing can help us stay {#blank#}10{#/blank#} shape, which in turn keeps us healthy.