Many people know that rubbish is a big problem on planet Earth. What many people don't know is that junk (垃圾) has become a problem in outer space too.

    According to BBC News, there are more than 22, 000 pieces of space junk floating around the earth. Andtheseare just the things that we can see from the surface of the earth by telescopes (望远镜). There are also millions of smaller pieces of junk that we can't see.

    Objects, like bits of old space rockets or satellites, move around the planet at very high speeds, so fast that even a very small piece can break important satellites or become dangerous to astronauts. If the tiniest piece of junk crashed into a spaceship, it could damage the vehicle.

    To make things worse, when two objects in space crash, they break into many smaller pieces. For example, when a U. S. satellite hit an old Russian rocket in 2009, it broke into more than 2,000 pieces, increasing the amount of space junk.

    To reduce additional space junk, countries have agreed that all new space tools can only stay in space for 25 years at most. Each tool must be built to fall safely into the earth's atmosphere after that time. In the upper parts of the atmosphere, it will burn up.

    Many scientists are also suggesting different ways to clean up space junk. In England scientists are testing a metal net that can be fired into space junk. The net catches the junk and then pulls it into the earth's atmosphere to burn up. The Germans are building robots that can collect pieces of space junk and bring them back to Earth to be safely destroyed.

    "The problem is becoming more challenging because we're sending more objects into space to help people use their mobile phones and computers," says Marco Castronuovo, an Italian space researcher.

    "The time to act is now. The longer we leave the problem, the bigger it will become," he says.

You can learn a lot in a club. After you join a club, you can know how to play basketball, how to cook or how to speak English. These new things make you better. Also, good chances like a basketball match, a music festival or an English show, are easy to get when you are in a club. 

In a club, you can meet new people and make friends with them. Then, you can play games and have a great time with them. They can be your teachers too, and you can get new things from them. 

At last, joining a club makes you busy. You always have things to do, so your life will be quite interesting. 

According to Chinese history, sky lanterns were first used by Zhuge Kongming. He sent them out to ask for help when in trouble. Today, sky lanterns are used at festivals and other{#blank#}1{#/blank#}. They are made of bamboo and covered with paper. When the lanterns are {#blank#}2{#/blank#}, they slowly rise into the air like small hot—air balloons for all to see. They are {#blank#}3{#/blank#}as bright symbols of happiness and good wishes. 

Paper cutting has been around for over 1,500 years. Paper cutting {#blank#}4{#/blank#}very easy but it can be difficult to do. The paper, usually red, is folded before it is cut with scissors. The most common pictures are flowers, animals, and things about {#blank#}5{#/blank#}history. During the Spring Festival, they are put on windows, doors and walls as symbols of wishes for good luck and a happy new year. 

Chinese clay art is famous because the clay pieces are so small but they look very 61. {#blank#}6{#/blank#}. The pieces are usually cute children or lively {#blank#}7{#/blank#}from a Chinese fairy tale or historical story. The pieces are{#blank#}8{#/blank#} shaped by hand from a very special kind of clay and then allowed to air-dry. After drying, they are fired at a very high heat. {#blank#}9{#/blank#}are then polished and painted. It takes several weeks to complete everything. These small pieces of clay art show the love that all Chinese people have for life and {#blank#}10{#/blank#}

What season is it in October? If you ask people from UK, they will tell you it's "autumn". But if you go to US, you will find that people use "autumn" or "fall". 

According to Dictionary. com, both words have been around for a long time. but neither of them was first to describe this season. During this season. crops would become ripe（成熟）and farmers would have a big harvest. So in Old English, this season was simply called "harvest". 

Then, in the 1600s, more people left their farms and moved to cities. With fewer people farming the word "harvest" became less useful. English speakers needed a different name for the season. They knew leaves fell from trees during the season, so people started calling it "the fall of the leaf", or "fall" for short. 

But at the end of the 1600s, autumn, from the French word "autompne" and the Latin "autumnus", came to English. "Fall" as the word for this season disappeared slowly. 

At the same time, people in UK were making their first trip to North America. They brought the words "fall" and "autumn" with them. That's why today Americans have two names for one season. 

Sometimes we make friends with unexpected （料想不到的） people. For example, who has ever thought that a spider would make friends with a pig? But in E. B White's classic novel Charlotte's Web, this is exactly what happens. 

In the story, Wilbur is an unlucky pig. When he was born, he is so small that the farmer wants to end the pig's life. Luckily, the farmer's daughter stops him from killing Wilbur and decides to raise the pig in a barnyard（谷仓的院子）. 

Wilbur grows day by day and makes many friends in the barnyard, the spider, Charlotte is one of them. However, one day a sheep tells Wilbur that he will be served up as dinner. But Charlotte has decided to save her friend from this danger. By making words such as"famous pig" in her web（网）, she makes the farmer believe that Wilbur is some kind of amazing animal, too important to kill. After Wilbur is saved, Charlotte is so tired that she finally dies. 

Actually, the writer makes a spider the hero of the book. Many people are afraid of animals like spiders. But Charlotte does everything in her power to keep Wilbur alive. It shows how a strong friendship can last through the worst possible time.