Being safe in your everyday life needs knowledge. If you _______ the following information, your life will be much _______.

Always notice the environment around you. You shouldn’t _______ alone outside. Make sure where the public phones are. If _______ happens, you can find them _______ .You should carry _______ bag towards the front of your body instead of _______ it on your back. When a bus is full of people, it is _______ for a thief to take away the things in the bag on your back.

_______ you are followed by someone you don’t know, cross the street and go to the other way. Let the person ________ that you know he or she is after you. Next, ________ home at once. You are safer in the street than you are alone in your home or in a lift.

If you have to take ________ bus to a place far away, try ________ to the stop a few minutes earlier before the bus leaves. This stops ________ people from studying you. On the bus, don’t sit alone. Sit behind the drive ________ with other people. Don’t sleep.

Online shopping is more and more popular. You can shop without leaving your house. Just sit in front of your computer, click your _______ and your things will be sent to your house in several days.

On 11 November, 2020, tmall.com, the biggest online shopping site in China, _______ things worth more than 370 billion yuan in total.

“Goods（商品）online are often much cheaper. It also _______ me a lot of time. I can _______ different kinds of goods online and I don’t need to go to different shopping mall, ” said Wang Xin, an online shopping lover in Beijing. She often stayed up until midnight to buy a lot of cheap goods _______ during shopping festivals.

Online shopping also helps people get things from different places _______. “I like eating duck necks very much and Tmall makes it _______ for me to buy them from shops in Wuhan, ” said Zhang Xi, a girl in Yangzhou.

While enjoying online shopping, many people also have _______ especially for middle school student buyers. They are attracted（吸引）by advertisements on the Internet and buy things they don’t need. Besides, online shop owners have no idea of their buyers’ _______. People, even young students, can buy anything they want. Some of the goods are ________ for them such as cigarettes and wine.

It’s ordinary that students have problems with English in their school life and daily life. Many of them would like to write letters to Dr. Lin for help.

Most of us spend all day at school or work. After a long and busy day, all we want to do is return to a comfortable home. Smart technology (科技) can turn any home into a nicer place to live in.

Smart homes have been around for some time. The Scottish company Pico Electronics invented a type of technology called X10. With X10, household devices (家用设备) like lights and alarms (警报器) can communicate with each other by using radio waves.

Of course, 5G networks have made smart homes much more wonderful than X10. Perhaps the most widely used smart home technology is the voice-activated assistant (语音激活助手) . Google Home and Amazon’s Alexa allow users to interact (互动) with nearly any device in their home simply by speaking a few words. This is especially good for children and disabled people, as they can do things that would usually be too difficult, according to How-To Geek.

Common household devices can become “smart” as well. For example, according to HowStuffWorks, a smart dustbin can record the things you’ve thrown away and place an online order for new things. Smart fridges can create dinner recipes (食谱) using the food inside.

But it’s not just about convenience. Smart homes are also good for the environment. By turning off devices that you’re not using, smart homes can lower the electricity you use. Using less energy means that we use fewer natural resources, which is good for the environment.

When a plane crashes, people will mention the “black box”     41     Because it is bright orange, it is easier for people to find the box after a crash.

What is a black box? A black box is a data recorder（数据记录仪）. It records up to 300 different kinds of information about a flight. For example, it records a plane’s speed     42     This helps people know just what happened before a crash.

In what part of a plane is a black box put? Many people are surprised to learn that a black box is not in the front of a plane.     43    

How do the recording devices（设备）inside a black box survive（幸免于）a crash? A black box is made of very strong materials.     44     It gives protection from the crash itself. And it protects against very high temperatures and fire.

Why is a black box so important? A black box records important information. Without it, many questions about an accident could never be answered.     45     As a result, plane makers can make changes so the problem will not happen again.

The Internet is widely used in our daily life. Now China has more than 162 million Internet users. This is the second largest n    46     of users in the world. Today, 66% of Chinese netizens are teenagers. They s    47     about 13 hours on the Internet every week.

The main reasons why teenagers surf the Internet are to search for information. It can h    48     students with their homework and widen their knowledge. In a    49    , students can use the Internet to write letters and send emails to their friends. Some useful lessons on the Internet are p    50    . Many students like them and learn a lot from them.