Albert Einstein is right once again! He thought of the idea about gravitational waves years ago with his Theory of Relativity, but scientists are finally discovering that it really exists now. But what are gravitational waves, and why are they important?

    Well, gravitational waves are made by black holes and can change time in space. Black holes aren't holes but are lots of matter put together into a very small area. They are created when a star, much like our sun, explodes and leaves behind this dense* material. It doesn't shine like a star any more, and it becomes black.

    The black holes that made these waves are special. About 1.3 billion years ago, there were two black holes that kept moving closer and closer together. Finally, they hit each other and formed one big black hole. The energy is given off and created the ripples* in space. These ripples are gravitational waves. For example, imagine you throw a stone into a pool. It creates ripples that change the shape of the water. Well, that's kind of what the influence of one black hole hitting the other has in space.

    Gravitational waves are hard to explore. But thanks to the efforts of scientists, the ripples were discovered on Feb. 11th, which is the first time in human history. Einstein was excellent to know this 100 years ago before we have the technology. It can give us a new view of the universe we live in. The discovery of gravitational waves, unlike stars, galaxies and other bright objects, black holes don't produce light, so we can't see them by tools. Gravitational waves allow scientists to look at the universe not only with light, but also with gravity. "Everything else in astronomy like the eye," A scientist told The New York Times. "Finally, astronomy grew ears. We had never ears before."

    Now, we will be able to find black holes and things that are much further away from Earth, which means much more space exploration in the future. And who knows, this discovery could even lead to time travel!

When we build a new house, we often buy something beautiful to decorate it. The painting is always the first thing we want to buy. People from all over the world mostly like western paintings. But as a Chinese, I think Chinese paintings are the best.

Chinese paintings are one of the oldest kinds of paintings in the world. Chinese artists first started painting over two thousand years ago, and painters in China are still using many of the same ways today.

Chinese painters usually paint natural scenes(自然景观), animals or people. We can only see buildings in Chinese paintings when they make up a small part of a natural scene.

There are two kinds of traditional Chinese paintings. The first one is the gongbi style. People need a lot of time to make this style of painting, because they paint everything in great detail(细节). This style often uses a lot of colour. Long ago, most painters in China used the gongbi style.

The second style of Chinese painting is the ink-wash painting(水墨画), Painters usually finish ink-wash paintings very quickly and they may not always have much colour. Ink-wash paintings have fewer details, because the painter is trying to show something with just a few brushstrokes(笔画). Most ink-wash artists do not work as painters. They paint as a hobby. But a good ink-wash artist can still become famous.

You may not realize that you are doing much more than just studying when you are at school. {#blank#}1{#/blank#} But this is not always easy. What can you do if you just don't like one of your classmates？

If you discover that you have problems getting along with your classmates or friends，the most important thing to learn is tolerance（宽容）. {#blank#}2{#/blank#}We can not change the way that other people do things，so it is important to learn to live happily with them. Tolerance will make everyone get on better with each other. Getting to know someone may help you understand why they do things differently. Something different doesn't exactly mean that is bad. Tolerance teaches us to keep an even（温和的） temper and open mind. 

You need to remember an old saying，"{#blank#}3{#/blank#}". You are always treated kindly by your classmates，so it is important to treat them kindly，too. If you tolerate something{#blank#}4{#/blank#}. Tolerance just means that you should respect the differences in others and not try to make them change. 

{#blank#}5{#/blank#}，because it will make everyone's life easier. Learn to accept people their different abilities and interests. The world is very varied（丰富多彩的） and practicing tolerance in your own school and city can help make a difference. 

Each of us, rich or poor, should at least have one or two good friends. Your friends will listen to you when you speak, will take care of you when you are sick, and will be together with you in your journey through life. {#blank#}1{#/blank#} Here are some tips.

Keep in touch with people.

{#blank#}2{#/blank#} Get out of the house and do things that will put you in touch with people. Look people in the eye when you are talking to them. In that way, people will find it easier to talk to you. {#blank#}3{#/blank#} Because they may think that you are not interested in them.

Be a good listener.

Let people talk about themselves before talking about "me, me, me". {#blank#}4{#/blank#}

Make friends with people you really like.

Try to make friends with the kind of people you really like and respect, not just with those who are easy to meet.

Help and believe in each other.

Give your friend a hand when he or she is in trouble. {#blank#}5{#/blank#} Believe in each other. This is the most important thing in a friendship. Even the best friends may have a quarrel (争吵) sometimes. If this happens, don't let your quarrel last too long. Try to make up with (和好) your friends soon.

Football is a wonderful game for children. It is also a popular sport in the world.{#blank#}1{#/blank#} Here are some reasons. 

{#blank#}2{#/blank#} Even a 3- year- old child can easily understand the rules. You have 90 minutes to try to get the ball into the other net (球门网). You can try as many times as you can. But there is a rule you must care: {#blank#}3{#/blank#}

You can play football anywhere in the city.{#blank#}4{#/blank#} An open place will be enough for playing football. You can play it at school, on the beach or in the park. You can play it by yourself or with your friends.

{#blank#}5{#/blank#} Would you like to have a try?

 For centuries, humans have made great efforts to study the Moon. Galileo, the Italian astronomer, noticed the mountains and lands on the Moon with a telescope(望远镜). In 1969, the US Apollo 11 project marked the first time that humans set foot on the satellite. Recently, China' s Chang'e 6 brought back the rocks and soil from the far side of the Moon for the first time in history. You may wonder: what is the value of exploring the Moon?

 Many scientists believe that the Moon was made of the rocks and dust from the baby Earth. When the solar system(系统) just formed. a Mars-sized object crashed into the Earth. The force of the crash was so great that it sent materials from the Earth, and from the object that hit it, back into the space. Some of the rocks and dust stuck together and created the Moon. 

 Those materials on the Moon's surface(表面) have stayed unchanged for over three billion(十亿) years, since it does not have an Earth-like atmosphere. This simple fact makes our Moon a time capsule, which allows scientists to uncover the Earth's past. 

 It is also about our future. In the last two decades, water was discovered on the Moon. It may help future humans look for drinkable water, breathable air, and rocket fuel outside the Earth. Besides, the Moon is a proper place to test technologies required for deep space exploration, including sending humans to Mars. 

 Considering the important role that moon exploration plays in scientific research and human future, scientists suggest that human activity on the Moon should avoid bringing harm to its environment.