The Great Wall of China is one of the greatest wonders of the world. With a 1of more than 2, 000 years，some parts of the Great Wall have disappeared. 2, it is still a very popular place of interest.

    It is the 3 wall ever built. It is about 8 meters high. The top is 8 meters wide and it 4 even wider at the bottom. It is made 5 stone and brick. People built it by 6 and it took a long time to finish.

    No one knows 7 when the building of the Great Wall was started. It is believed that the wall was built to 8 parts of the country in the old days. It also made people live a（n） 9 life.

    Today, many of the visitors go to see the Great Wall. 10 they stand on top of a tower and look down on this wall, they can't help saying, "Wow, that's fantastic!"

—Oh, it is very dangerous to do it in the street.

—He likes collecting newspapers, ___________ old newspapers.

—OK. I'll do it right now.

—I ___________ I made a mistake, but the problem is not as serious as you think.

—Me too. I have to wear it on weekdays.

    One day I ran into a stranger as he passed by me. I said sorry to 1immediately. He replied with a smile and said, "I'm sorry, 2. I wasn't watching out for you."

    Later that day, when I was cooking, my3was too close to me When I turned to get 4 milk, I nearly knocked her over.

    "Move out of the way!" I shouted.

    She walked away 5. But I didn't feel like I had to say sorry to her.

    While I was in bed that night, my husband said to me. "While dealing with a stranger, you were 6, but with the daughter you love, you were unkind. Your daughter 7 you some flowers she picked herself. You'll find them in the kitchen by the door. Have you seen the tears 8 her eyes?"

    I felt quite sorry for my lovely daughter. Then I went to her bedroom to tell her shouldn't have 9 her. She kissed me on my cheek and said, "It's OK, mom. I love anyway."

    If we can be polite to strangers, 10 can't we do the same for the ones we love?

    If you look at the top of your phone, you'll usually see a little symbol that says 3G or 4G. The "G" stands for the "generation" of your mobile network. But these symbols will become things of the past after 5G fully arrives.

    On March 30^th, 2019, Shanghai vice-mayor Wu Qing made the first 5G video call on a Huawei Mate X smartphone, CGTN reported. Shanghai has also become the first city in China to start testing 5G networks.

    Now, 4G takes about 100 to 200 milliseconds(毫秒)to send and receive data(数据). But 5G will get it down to 1 millisecond or less. This big change will not only make our mobile Internet faster. It can be used in many other ways as well.

    For example, 5G will help to make self-driving cars safer. Today's self-driving test cars have one problem-lag. When the car "sees" an obstacle(障碍物), it sends this information to a data center and receives instructions. However, it takes time to send and receive this information. With this kind of lag, the cars might crash(撞击)because they don't receive instructions in time. With 5G, this lag will be greatly lowered, making the cars safer, according to CNN.

    5G could also be used to power the Internet of Things(IOT). This refers to a large online network that connects all things and people. Fast Internet speeds will be the key to developing this technology. For example, with IOT under 5G, your refrigerator could automatically(自动地)place an order online for eggs when it finds that there are no eggs left inside.

    All in all, 5G will shape every type of technology that it touches. And you won't have to wait too long for that to happen.

    Two seeds(种子) lay side by side in the soil(土壤).

    The first seed said, "I want to grow! I want to send my roots(根) deep into the soil, and stretch my sprouts(新芽)through the earth above me. I want to feel the warmth of the sun on my face and the beauty of the fresh dew(露水)on my flowers in the morning! I will make friends with other plants, and we can grow together. "So she grew. However, she found that the other seed did nothing. She was curious(好奇的)and asked, "Don't you want to come out and see?"

    The other seed said, "I am afraid. If I send my roots into the ground below, I don't know what I will come across in the dark. If I push my way through the hard soil above me, I might hurt my sprouts. And if I open my flowers, a naughty(顽皮的)child might pull me out of the ground. No, it is much better for me to wait until it is safe."

    The first seed didn't know what to say. The second seed sat there silently. A hen was walking nearby and looking for food. She found the second seed and ate it. Like this seed, if we do not take risks in order to grow, life may swallow(吞掉) us.