{#blank#}1{#/blank#} ⑴The first thing to remember is that when a friend invites you over, you need to arrive on time. If your friend tells you to come "around 3:00", that means you can turn up a little bit after 3:00. But usually it is a good idea to arrive at the right time.

{#blank#}2{#/blank#} ⑵Often it is also nice to bring something to your friend's house. This could be a box of chocolate for you two to share, or maybe a movie that you can watch together. You can also bring some flowers. A little gift is a nice way to show your friend that you are excited to be at his house.

{#blank#}3{#/blank#} ⑶When you visit your friend's house, you may also meet his parents. You should tell them who you are and they may tell you their names, and then they may tell you to call them by their first names. Another way to show respect is to call them Madam or Sir.

{#blank#}4{#/blank#} ⑷As we all know, students should learn how to get on well with others. But in what ways? First of all, we should respect others. Everyone has their own way to do things, so we should understand each other. Besides, it is important for us to communicate with each other. What's more, we should be kind to others and offer necessary help to those who are in trouble.

{#blank#}5{#/blank#} ⑸Everybody has his parents. But not everybody gets on well with his parents. Well, first, we should respect our parents because they bring us up and care for us all the time. Second, we are supposed to do some housework at home. We should help clean the room, cook meals and so on. Third, we should care for them, have a talk with them about their work.

Each country has its own "art of living". For example, the word "niksen" shows how Dutch people fight stress and tiredness in a fast-paced lifestyle.

The term "niksen" comes from the Dutch word "niks", which refers to"nothing". In practice, "niksen"could be as simple as just relaxing, looking at your surroundings or listening to music- as long as it's without purpose and not done in order to achieve something. Think "simply sitting in a chair or looking out of the window,"says Ruut Veenhoven, a professor at Erasmus University who studies happiness.

"Niksen" sounds contrary to the advice that we were all given as kids. Nowadays, we're always told to stay bus y and work harder than everyone else. But "niksen" is against that attitude. It offers the chance to "deliciously do nothing", as Carolien Hamming told Time. She thinks that "niksen" is very important to staying healthy, since it's a form of men tal relaxation and healing. Just like a wild animal lying in wait for their food,"niksen" seems to be a natural state of being.

For some people,"niksen" can mean more than just men tal relaxation. It's also a way to imagine new ideas or plans. As an early adopter of "niksen", Jenny Holden, adds it to her daily lunch breaks."Within 10minutes of doing nothing-just staring and listening to myself-my head began to clear and pick out my work and home to-do lists", she told the Metro UK. However, for many, doing nothing isn't as simple as it sounds.In fact, it can be somewhat challenging to sit still and stare out a window.

Above all, "niksen" is a suggestion for balancing work and rest. As Dutch-bom writer Ogla Mecking wrote in Whoolly Magazine,"niksen" is the full enjoyment of life's breaks".

Everyone is encouraged to have your "niksen" moments. They give you the strength to face everyday challenges.

When you open a map on your phone, you might think it is guided by the Global Positioning System (GPS) without giving it a second thought. However, today, most of the online maps in China uses the Beidou Navigation Satellite System(BDS，北斗卫星导航系统).

China started to build the BDS 30 years ago. Back in 1978, the US already started providing navigation services with its GPS. However, depending on a navigation system from another country is not safe.

In 2020, after over 20 years of hard work, Beidou completed its global network. The BDS became the fourth global navigation system after the GPS of the United States, Galileo of the European Union and GLONASS of Russia.

The BDS is the first navigation satellite system to provide a global short message communication service. It means you can text others in places without phone signal or internet. For example, in February 2023, a hiker got lost in heavy snow in Inner Mongolia. He sent a text message using the BDS-powered chip in his phone and got saved in time.

Besides, the Beidou system plays an important role in disaster prevention and response(灾害预防和响应). Rescuers(救援人员) can communicate through the BDS quickly and clearly.

No matter where you are in the world, the BDS can help guide your way. By 2023, it had provided service for over 120 countries. "By 2035, China will build a positioning, navigation and timing system with the BDS at its main aim to provide more smart services," Ran Chengqi, director of the China Satellite Navigation Office, said at a news meeting in 2018.

There is a small thing we use every day. We usually put {#blank#}1{#/blank#}in the bathroom. Without it, we might have tooth problems. Can you guess {#blank#}2{#/blank#} it is? Yes, it's the toothbrush. But do you know anything about its history?

According to some research, before toothbrushes appeared, the ancient Chinese people {#blank#}3{#/blank#}their teeth with some small tree branches (树枝). About 800 years ago, people made a kind of brushes with pig hair and bamboo. It might {#blank#}4{#/blank#} the world's earliest form of toothbrushes. As time went{#blank#}5{#/blank#}, the forms of toothbrushes changed. For example, people chose horse-tail hair instead of pig hair {#blank#}6{#/blank#} pig hair was too hard. Imagine that you travel back to {#blank#}7{#/blank#}of years ago and brush your teeth comfortably. It sounds fantastic, doesn't it?

Around the 15th century, the Chinese toothbrush found its way into Europe. It became {#blank#}8{#/blank#} among local people soon. The {#blank#}9{#/blank#} of toothbrushes was not as famous as that of paper-making, but it was very useful in daily life. Today we have a good {#blank#}10{#/blank#} of brushing teeth. We should thank the ancient Chinese for it.

No one can be happy all the time. You may become unhappy sometimes. Do you know what to do with that? Maybe you can do the following things. They can help you become happy again.

Too many Americans watch too much television. Americans maybe watch more TV than any other people in the world. This is not a good thing. Because of TV, Americans are getting too heavy and spend less time with their friends.

Many American students watch TV between twenty and sixty hours a week! That is very bad for their study. When they watch too much TV, they have less time for exercise, their study and sleep. Most people who watch a lot of TV eat food at the same time. This is very bad because they eat too much and become too heavy.

It is better to watch just a little bit of TV a day. Thirty minutes to one hour is enough. If you have much free time, it is a good idea to read a book, play sports or spend time with your friends and families. Studying is also a good way to spend your free time.