How much time do you spend in front of a screen every day? If your answer is about one hour, then maybe you are one of the ________ teenagers in the world.

Scientists did a ________. They asked students aged 13 to 18 how long it ________ them to have fun on phones and computers. They also asked about ________ feelings of happiness. They found that those who spend more time on their smart phones are unhappier. “Spend no more than two hours a day on digital media(电子产品), ________ try to spend more time with friends and on exercise. These two activities bring greater happiness.” Jean Twenge, the scientist who led the study, said.

Some people have a very poor sense of direction. Unluckily, I am one of them. I have visited a place many times but I may still get lost there the next time.

When I was a little girl, I never dared to ask strangers the way. And so I used to walk around in circles and hope that by chance I would get to the place I was going to.

Now, I am no longer too shy to ask people for directions, but I often receive helpless or even wrong information. So I try to avoid giving people wrong directions. If anyone ever asks me the way somewhere, I would say, “Sorry, I am a stranger here.”

Once on my way to work I was stopped by a man. He asked me if I could tell him the way to the Friendship Building. I gave him my usual reply. But just as I walked on only a few steps, I realized that he had asked the way to my office building. However, I had no time to turn back and look for him. I was rushing to meet with someone at my office and I didn’t want to keep him waiting.

When I just got to my office, the secretary (秘书) showed in the man who had asked me for directions. Imagine how embarrassed I was and how surprised he was when we saw each other at the first sight.

The construction（建设） of high-speed railways in China began with the building of the Qinhuangdao-Shenyang High-Speed Railway（HSR）in 1999．Now the high-speed rail network in China is the largest in the world．So far，there have been about 1700 kilometers of HSR in service，along with  trains of an average（平均）speed of 220 km/h．

Now Chinese government plans to spend ﹩300 million building the largest and fastest HSR system in the world by 2020． It's said that the trains can run 400 km/h and create new business for China and other countries through the Belt and Road．（一带一路）    

It's predicted that the HSR network in China will reach 30，000 kilometers and it will be like a grid， which is mainly made up of 8 long-distance high-speed rail lines： four north-south HSR lines and four east-west HSR lines． Except for the Qingdao-Taiyuan HSR， all HSR lines of the rail grid are longer than 1，000 kilometers．     

Feng Hao， an expert， says "Many markets along the Belt and Road， especially in Central Asia， Southeast Asia， the Middle East and Eastern European countries， are planning to build HSR lines．They look forward to getting technological support from China"．

It was on a cold winter night that I knew my mother was dying. I travelled miles from home to spend the last night with her. I sat right next to her sick body, reading her long-loved books. It was one of the most difficult and painful times in my life. After she died, for many days, I stayed alone in her room, with a lonely and empty heart. Everything was in silence.

But one evening the silence was broken: I heard crying outside. I opened the door to find a little dog on the steps. He was thin and poor. I brought him inside, fed him with some fish, and then he fell asleep.

The next morning, I learned that the dog’s owner had moved out, so the little dog was there all alone, just like I was. As I walked back to the house, I tried to work out what to do with him. Taking care of something seemed like the very last thing I wanted to do. But as soon as I opened the door, he ran to me and jumped into my arms. It was clear that he didn’t want to go anywhere.

When the time finally came for me to return home, I had to decide what to do about him. There was no way I would leave without him. From then on, things grew easier. With him around, time seemed to pass much faster.

Five years has gone since my mother died. Over the years, many people have said how nice it was of me to save the dog. But I know that we rescued   (拯救) each other. I may have given him a home but he gave me something greater.

My father died when I was five. It was hard on us all. My brother, who is eight years older than me, began to take care of my mother and me.

He took on more responsibilities than expected. I remember he made sure the rubbish was taken out, and the yard was cleaned. He did on his own, without being told to do so.

Because of my father's death, mom had to get a full time job. Brother would get me up for school and make me breakfast. While I was eating, he would lay out my clothes, ,make my bed, and gather my school books up.

Hand in hand we would walk to the bus stop. As we waited, he would play games my father used to play with me. When we returned from school, we were alone for about half an hour, until mom was home from work. Before I did my homework, he would sit me down with three cookies and a glass of milk. Then he would prepare something for mom to cook dinner.

Mom would greet us with a hug and kiss. This was our time to have some fun outside. This was my brother's time to be a kid.

One Saturday in June several years later, my mother and I were at a store where the Father's Day cards were sold. I stared at the cards. Mom said, "Cindy, I know this is hard time for you."

"No, mom. That's not it. Why don't they have Brother's Day cards?"

She smiled, "You're right, your brother has exactly been a father to you. Go ahead to choose

a card."

I did so, and on Father's Day, my mother and I sat my brother down and gave him the card.

As he read it, I saw the tears in his eyes. Mom said, "Son, your father is proud of you, seeing that he raised a good man, and that you do your best to fill his shoes. We love you and thank you."

One afternoon just before Christmas, an old kind man was walking in the street when he saw a little boy     56     in front of a beautiful shop window. The old man asked why he     57     crying there. The little boy said that he had lost the ten dollars     58     by his mother. When the old man     59     this, he put his hand into his pocket and took out a small wallet and gave him ten dollars. The little boy thanked him and     60    crying and smiled. The old man walked away     61    .

An hour     62     , the old man was returning home by the same route(路线). To his     63     , he saw the same boy at the same place. He went up to him and asked if he had lost his money again. The little boy said that he had     64     the dollars. He was     65     for him there.

Liu Wei is very famous in China because he can play the piano with his toes(脚趾).

One day when Liu Wei was only 10 years old, he played a game with some friends. He lost both his arms because of electricity.

Liu Wei was very sad when both his arms were cut off after the accident. But soon he had to make a choice. “For people like me, there were only two choices. One was to give up all the dreams, which would cause a quick death. The other was to work hard without arms to live an excellent life.” says Liu Wei.

Liu Wei’s dream was to be a pianist. He learned to play the piano with his toes. And teaching himself to play the piano with his toes was very hard. Many times he wanted to give up, but his parents went on encouraging him and he wanted to make his parents proud.

Maybe you can not believe that Liu Wei is able to play well only with his toes. The audience(观众) were deeply moved and very excited when they watched his performance.