“Everyone makes mistakes in life, but that doesn’t mean they have to pay for them for the rest of their lives. Sometimes wise people make foolish(愚蠢的) choices. It doesn’t mean they’re foolish; it means they’re improving!”

Sometimes mistakes mean something that you are trying new things. It’s good to try new things. Because when you are trying new things, you are growing. If you never have a try, you will never make progress. Look around you, everything you see is the result of someone trying new things.

I remember clearly what life was like back in 2006. I was 17 years old and in a really bad place.

In a chemistry 1ab, I was doing an experiment（实验）. I tried twenty times, but I couldn’t succeed. So I decided to stop doing the experiment. I felt a little unhappy.

Mr. Green seemed to understand my thought. He touched my head with a smile, “Young man, you have done a lot and you’ve got a lot. At least you know that there are twenty ways you can’t use to do this experiment.”

After hearing the words, I became excited again. I kept doing the experiment and at last I did succeed.

Two guitar makers lived in the same town. The young builder, who made the guitars very quickly and sold them at a low price. The old builder took his time and paid attention to the quality(质量). Everyone wanted to buy a guitar because it was a sign of being rich. So both builders were very busy.

But bad times came to the town, and no one had much money. The young builder did well. But the old builder went out of business because no one could afford his guitars.

After some years, the cheap guitars that people bought began to break. The guitars that the old builder made were still perfect. The people who bought cheap guitars went to the young guitar maker’s house to get their money back.

Suddenly, a voice called out from behind the people. “Wait!” said the voice. “How can you blame him? This man never said his guitars were good. He has always said that they are cheap. You didn’t care about the quality of the guitars. You cared only about how they made you look!” The voice came from the old guitar maker.

“I have spent my whole life learning how to make guitars that last a lifetime. And I can tell you that something that is really good takes time and efforts,” he said. All the people went home.

Today, there are many guitar makers in that little town, and all make guitars that last a lifetime.

My husband Shane and I were hanging out on the street one evening. I was talking but he was looking over at someone.

He walked over to a young girl who was crying. As he talked to her, I could see from his body language that he was trying to calm (使平静) her down. When I joined them, I realized that she had been homeless for some time. She told Shane that all she wanted was to go to her sister’s house in another city.

Some people would have handed her some money, wished her lunch or maybe allowed her to make a call. Shane did much more. He said, “Kelly, I can’t leave her here like this. Sometimes people need someone not only to help them but to believe they’re telling the truth.”

It was a bit cold, so we had an idea to take her home. When I asked her if she’d like to go home with us, she thanked me about a million times with tears in her eyes.

We went home and I gave her some clean clothes to wear and told her she could use the shower.   We ate something. Finally, she told us her story.

In the morning, she was finally able to get a hold of her sister, so she had a place to go. Shane drove her to the bus station and bought her a ticket.

Sometime what people need is not just money, but people who will trust, listen to and understand them.

Does blue light actually influence your health? Blue light before bedtime can make it harder to sleep, and the screens on phones, computers and televisions give out a lot of blue light. It is true. But if you think blue light as a main problem influencing your sleep or your eye health, it’s time to think in another way.

A researcher says that blue light is part of sunlight, and your eyes are under the sunshine all the time. You’re fine. There are studies of mice that have found blue light can be bad for the eyes, but mice are nocturnal creafures(夜行性动物) whose eyes are different from ours. In a sense, their eyes can protect themselves.

However, adding more protection isn’t likely to help. You can buy glasses to stop the blue light, but the researcher points out that the way will waste your money. You could get the same effect just by holding your phone far from your face. Try it now and see if you notice a difference. No? Then it shouldn’t surprise you that a recent research result said that blue—blocking(防蓝光的) glasses have no special effect(影响) on sleep quality(质量).

If you’re worried about your eye health or your ability to get to sleep on time, you already know what to do: put the screens away at bedtime. Read a book or find something else to do. While you’re using screens, take a 20—second break every 20 minutes.

AI（人工智能）makes our lives easier and     81    . Let’s see the amazing AI.

A bus door opens and you get on. Wait, where is the driver? Here is a new kind of driverless bus     82     Apolong. It has 14 seats and doesn’t need a driver. The bus follows traffic     83    . It stops as soon as it sees a stop light.

Hi, everyone. I’m Xiaoice, a chatbot（聊天机器人）. I speak like a 17-year-old girl. If you feel     84    , you can talk with me. I’m talented at singing,     85     poems and telling stories. I want to be your friend!

Hey, look! The famous Chinese anchor Qiu Hao is reporting the news for us. But, is “he”     86     Qiu Hao? The answer is “no”. This is the world’s first AI anchor. It looks and speaks just like a real person. It can work 24 hours and doesn’t make any     87    . You might see it on TV soon.

This beautiful painting was at an auction（拍卖）in 2020. The painting is worth     88     3,000,000 yuan! But it is not a work by a famous     89    , such as Vincent van Gogh. It was painted by an AI artist. Three Frenchmen     90     the AI artist. It studied over 15,000 paintings. In this way, it learned to paint.

It was 5 o’clock in the morning. Wang Yong, a deliveryman（快递员） in Wuhan, woke up early. Suddenly, he realized that it was already Febuary 13. He hadn’t been home for 22 days.

What had he been busy with during those 22 days?

The story started on the eve of the Chinese New Year. Wang was going to sleep. At 10 p.m., he saw an online post from a nurse at Jinyintan Hospital. Many COVID-19（新型冠状病毒肺炎） patients had been admitted（办理入院手续） into this hospital. The nurse had worked for a few days without stopping. She wanted to go home and have a rest, but she couldn’t. No taxi driver wanted to drive to the hospital. And because of traffic control, no bus or subway services were available.

After a moment’s hesitation （犹豫）, Wang decided to take on his duty. He bought himself some masks（口罩）, got into his own car and then drove straight to the hospital. The nurse seemed surprised. She got into Wang’s car and burst into tears.

That day, Wang drove 30 doctors and nurses home. He didn’t stop there. Wang set up a team of volunteers. They helped nurses and doctors to go to work, return home and order food.

In this fight against COVID-19, there are not only doctors and nurses fighting the good fight. Many ordinary people are also fighting. They are heroes, too.

In early 2020, due to the outbreak (爆发) of COVID-19, the national ministry of education began to encourage the students to take classes online. Three girls from different cities give their feelings about learning online at home. Also, they offer solutions to their problems about learning online.

To me, the biggest problem about studying online is my poor Internet connection. During the first online class, I couldn’t hear what my English teacher said and I had to reconnect. It took lots of time. Since then, I have checked my connection before class every day and asked my parents not to use the Internet while I’m in class.

During the first day of studying online, I was excited and listened carefully. After a few days I started to lose interest in it, because I found that my teacher had no idea about what I was doing at home. At the same time I found my self-discipline was weak. So I’ve set scereen time for all of my electronic devices (电子设备). When I was resting, I walked around my house. At night, I didn’t play computer games any more and did preview (预习) work for the next day.

It’s important to know how to choose wisely when we pick online courses. For example, I had difficulty understanding certain English grammar points, so I searched for key words on our national cloud learning platform (平台) and watched several videos from teachers across China. It’s good for us to learn from different teachers. I think previewing subjects and finding the right courses are the most important factors (因素) when studying online.

When I was in primary school, I had a big argument with a boy in my class. I can’t remember what it was about, but I have never forgotten the lesson I learned that day.

I am sure that I was right and he was wrong. However, he strongly believed that I was wrong and he was right. The teacher brought both of us to the front of the class and placed him on one side of her grey desk and me on the other. In the middle of the desk was a large, round object. 64.It was clear for me to see that it was black. But the boy said it was white. The teacher asked us to change places and told the answer. I said white and the boy said black. It was an object with two differently colored sides, and from his side it was white. Only from my side was it black.

My teacher taught me a very important lesson that day:65.You must stand in other person's position and look at the situation through their eyes in order to truly understand their ideas.