is, even scientists can't why we need to sleep.

—Well, I've been working hard all the time. Surely I ______ any exam.

Before graduating from college, Jackie began to look for a job. She aimed at a famous company, but the 1 for such jobs was very strong. The company Jackie chose planned to employ only one person, but more than twenty people applied for the job. 2 , Jackie was one of the three people invited for the final interview. The interview was very 3 . The interviewer asked just a few questions and it was all over in less than 10 minutes. Then the interviewer said to them, "All of you are very good. Please go home and 4 our response. "

Three days later, Jackie received a message, saying that she would not be 5 the job. She felt deeply disappointed. That evening, however, she received another 6 . This time it said that she got the job.

Jackie later found out that the first message sent to her phone was part of the interview—a 7 to see if she was suitable for the job. All the three people received the8 text, but only Jackie's reply 9  the company. Of the three, one did not reply. Jackie said "thank you" and another said "goodbye". This reply showed that Jackie was a/an 10 person, so the company offered her the job.

We once had a poster competition in our fifth grade art class.

"You can win prizes," our teacher told us as she wrote the poster information on the blackboard. She passed out pieces of construction paper while continuing," The first prize is ten dollars. You just have to make sure that the words on the blackboard appear somewhere on your poster."

We studied the blackboard carefully. Some of us looked with one eye and held up certain colours against the blackboard to make an outline for their designs. Others twisted their hair around their fingers while deep in thought. We had plans for that ten-dollar prize, each and every one of us. "I'm going to spend mine on candies," one hopeful would say, while another practised looking serious, wise and rich.

Everyone in the class made a poster. Some of us used parts of those fancy paper napkins, while others used nothing but the coloured construction paper. Some of us would go past the good students' desks and then return to our own desks with a growing sense of hopelessness. It was an adult's trick. They seemed especially fond of making all of us believe we had a fair chance, and then always -always -giving prizes to the same old winners. .

I believe I drew a sailing boat, but I wasn't sure about that myself. I made it. I admired it. I determined it to be the very best of all of the posters I had seen, and then I turned it in.

Minutes passed. No one came along to give me the prize， and then someone distracted me, and I probably never would have thought about that poster again. I was still sitting at my desk, thinking nothing until the teacher gave me an envelope with ten dollars in it. Everyone in the class cheered for me.

     Du Yijun, a 21-year-old Fudan University student, was one of the 36 people who died in the crush on New Year's Eve on the Bund(外滩) in shanghai.

     On the night of December 31, 2014, a holiday celebration turned into a terrible tragedy. “Overcrowding(过度拥挤) and the failure of the police to control the crowds were the main reasons it happened,” the authorities(官方) said.

      For the last three years, light shows on the Bund have been successfully held for New Year's Eve celebrations, but this year the light show was canceled and there were fewer police on hand. But the crowds came anyway.  About 300,000 people were on the Bund by 8:30 that evening and more kept arriving until people suddenly became noisy and angry around 11:30. Some people fel1 on lhe stairs and were stepped heavily on and died.

      In shanghai, the authorities have reacted(作出反应) to the Bund tragedy by canceling big events. But this isn't really necessary. Better planning and better crowd control can make sure the celebrations are safe.

     However, if you're going to a place where there will be a big crowd, you should take notice of where the exits(出口)are, and if there are too many people, move away from the center of the crowd. And most importantly, if the crowd seems too big and makes you feel uncomfortable, Just leave. No celebration is worth losing your life over.

    Most of us have played video games with friends, but how many of us know  the games are made? Let me tell you about  process in four basic stages.

    First of all, most games are produced by a team who work (close) together. They have lots of meetings where the basic story and characters (discuss).When the artists have made an agreement, they produce a set of drawings can show the characters and the places in the game.

    Next, the drawings are created the programmers. Then all the colors are painted, so the places and movements look real.

    After that, the (part) of the story are put in order. Then the player options (选择) are produced. So now the game has  (it) two key parts: the different levels of difficulty and all the tasks for the players.

    The final stage is as important as the other ones: game testing. A group of players are asked (use) the game and communicate any problems they find. Once these problems are solved, a much (good) game is ready for you to play.