Haiyan is 7 years old. Her parents gave her an iPad as a gift for her birthday. A month later，her eyesight（视力）dropped to 300 degrees. This is serious for such a young child.

    Many children in China are facing the same problem: iPad using is bringing problems to their eyesight. The problem is so common that newspapers even call the iPad the "No. 1 killer of children's eyesight!"

    "There are about 30 shortsighted children coming every day, "said Hu Dali, an eye doctor at Guiyang Aier Eye Hospital. "Half of those children have poor eyesight because they have played with phones and iPads for too long. "

    Doctors and scientists say children's vision（视觉）is not yet fully developed and their eyes get tired more easily. The screen of an iPad uses very bright（明亮的）LED backlight. If children look at an iPad screen for a long time, their eyes do not have time to rest. This will make their eyesight worse over time.

    Doctors advise that users should hold their iPads between 40-60 centimeters（厘米）away from them. The brightness of the screen should be comfortable for children. Parents should also stop their children from using an iPad for more than one hour every day.

Beijingis the capital of China. It is a very1 city. Lots of people live and work there. Itusually takes them a long2toget to work.

Myfriend Zhang Yu works in a company (公司) in Beijing. Thecompany is3from his home. He goes to work either bybus4 bysubway. When he gets up early, he5the bus to work. His home is next to thefirst stop of the No. 456 bus. It is easy for him to get a seat (座位)6 the bus. But hespends (花费) two hours getting to the7. When hedoesn't get up early, he takes the subway. It takes8 aboutone hour to go to work by subway. But there are too9people on it. Sometimes Zhang Yu can't even(甚至)10!

Itis Zhang Yu's dream to buy a house near his company. Can his dream come true?

A few days ago, the British polar explorer and environmentalist (极地探险家及环境学家) Robert Swan visited our school and we asked him to give a talk on his trips. He was the first person walking to both the North and South Poles and he did something really amazing by reaching the South Pole only on renewable energy (可再生能源) . 

Swan's stories of his trips really impressed me. It was more than 30 years ago when he first went to the South Pole. There was nothing they could use to talk to people outside there and the nearest person to him and his teammates was 2, 500 kilometers away. So they had to face all the problems by themselves. He also told us that when taking a shower during the trip, you had to take off all your clothes in the temperature of -30℃ and finished the shower as fast as you could. 

In 2017, Swan set foot on the South Pole again, this time with his son. The trip was highly great, not only because Swan was already 61 years old, but also because it was the world's first trip to Antarctica (南极洲) to be made only using renewable energy. 

Also, he talked about the importance of saving energy and taking good care of our planet (星球). After his talk, I was sure what I should do and the hope for the wonderful future washed over me. 

 Frank is a nice American boy. He is a fourteen-year-old middle school student. His school is big, clean and beautiful, so he likes it very much. There are many nice trees and flowers in it. Frank' s classroom is on the second floor of a brown teaching building. There are twenty-four students in Frank's class. Frank has to study different subjects, and geography is his favorite subject. His geography teacher is David Green, a short and interesting man. He says it's fun to study rivers, lakes and mountains with Mr. Green.

He also likes computer science, and the computer classroom is his favorite place. There is a computer for every student. Students can use computers to finish their homework, but they can't play computer games in class. Some computer lessons are difficult for Frank and he always studies them hard(努力地). Computer science is very important to Frank, because he wants to work in a big computer company (公司).

Three hours, thirty-five minutes and thirty seconds. It took Belachew Girma the1 to set a world record(纪录). This man from Ethiopia didn't set a world record for running or jumping. He set the world record for laughing2 . Belachew Girma laughed for 3 3 hours without stopping!

However, Belachew Girma didn't always like to laugh. 4 , he wasn't very happy in the past. After his wife died, Belachew Girma thought he would5 laugh again. Then, someone taught him how to laugh. Belachew Girma started to know: laughing made him feel good. So he wanted to laugh all the time. 

Belachew Girma practiced laughing night and day. The only time he didn't practice laughing was when he was6 . Someone told Belachew Girma about a laughter7 and he decided to take part in it. He went on practicing his laughing8 . After laughing for over 3 hours

Belachew Girma 9 the competition. He10 a world record holder(持有人)! He didn't have time to be sad or to worry11 he was always laughing. 

Belachew Girma wanted to help12 by laughing. He travelled around the world to13 his experience(经验) with people. To Belachew himself, laughing saved his14 . Today, he finds poor kids and teaches them to laugh. When kids laugh, it15 their sadness. The laughing makes them much happier and healthier. It helps make their lives better. 

Belachew Girma knows: The more he laughs, the more others laugh too. By laughing, he expects to make the world a happier place. 

"It's hard to say this, but I' ll have to leave school in a few weeks' time," said Mr Thomas, standing at the front of the classroom.

It was early on Monday morning and Mr Thomas' students were shocked(震惊的) at the news.All of them loved Mr Thomas very much and they never thought that he might leave.However, Mr Thomas reached the age when he was going to retire.After hearing the news, the class kept gloomy for the next few days until the class monitor gave them a small scolding(训斥).

"We should not be like this," she said."Instead(反而), we should study hard to thank Mr Thomas for being so good to us." The class agreed, and they thought of an idea of having a farewell(送别的) party for Mr Thomas to surprise him.

On Mr Thomas' last day at school, everybody brought a different kind of delicious finger food to class and put it in the middle of the classroom.They covered the blackboard with farewell messages.When Mr Thomas showed up, all the students said "Goodbye, dear teacher!" together and promised Mr Thomas that they would do their best in schoolwork in the future.

Mr Thomas was really surprised.And he was really touched.The class, in turn, was glad that they did the right thing.After all, it was the simplest way to show thanks to their favourite teacher.