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Many years ago, people didn't know how to (1)　 their teeth. They used charcoal (木炭), lemon juice, ash (the stuff left over from fire) or tobacco and honey (2)　together to clean their teeth! It was only about 100 years ago (3) someone(4)　 toothpaste to clean teeth. Most people don't know that snails (蜗牛) have teeth. But they (5) . In fact, they have around 25,600!

Rats chew to wear out their front teeth. If they lose a top tooth, the bottom tooth will grow up in its place. And it won't (6)　! It will grow right into their brain. John Massis (7) Belgium (比利时) was famous for his strong teeth. On April 4, 1974, John Massis went to New York to (8) his teeth. He bit down on a long thick rope. The rope was tied to two trains. They weighted 80 tons. He (9) the trains away for several metres with his teeth. People have used fake teeth for many years. (10)　ndline, they used other people's teeth, animals' teeth, and wooden teeth! The (11)　 president (总统) of the United States, George Washington, had bad teeth. (12) he used fake ones made from animal teeth. But they hurt when he (13) ndline. And they went bad after a short time. Queen Elizabeth I of England used to have a serious tooth (14) .(15)　her time, fake teeth were hard to find in England. She was always in pain. Her fake teeth were made out of porcelain (瓷), which is often used to make plates. They were difficult to eat with.

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　　I can't remember when I started collecting litter.But it was when I got tired of 1 　 litter nearby and realized that 2 　 was going to pick it up.

　　I live near a 3 　 in Enshi,Hubei Province.I can walk there in three 4 ndline!I 5 　 love going there to play with my dog.But one day there was so much litter there that I became very unhappy.I decided I had to clean up the forest.I wanted to 6 　 happy going there again.

　　I made my 7 　 trip to clean the forest that afternoon.I took a big black rubbish bag with me.Ten minutes 8 　 starting to pick up litter,my bag was full!It had cans,bottles,broken glass and newspapers in it.From then on,I went to the forest four times a year to pick up the litter.I often 9 　 there for three hours.It makes me feel 10 　 to do something for the environment.

　　After each trip,I 11 　 all the litter that I've found.If 12 　 of it is recyclable(可回收的),I keep it.I can't 13 　 why people drop litter.But I will keep picking it 14 　 they stop dropping it.I know I am only doing a small bit to help 15 ndline,but I still think it is important.

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　　I can't remember when I started collecting litter.But it was when I got tired of 1 　 litter nearby and realized that 2 　 was going to pick it up.

　　I live near a 3 　 in English,Hubei Province.I can walk there in three 4 ndline! I 5 　 love going there to play with my dog.But one day there was so much litter there that I became very unhappy.I decided I had to clean up the forest.I wanted to 6 　 happy going there again.

　　I made my 7 　 trip to clean the forest that afternoon.I took a big black rubbish bag with me.Ten minutes 8 　 starting to pick up litter,my bag was full!It had cans,

bottles,broken glass and newspapers in it.From then on,I went to the forest four times a year to pick up the litter.I often 9 　 there for three hours.It makes me feel 10 　 to do something for the environment.

　　After each trip,I 11 　 all the litter that I've found.If 12 　 of it is recyclable(可回收的),I keep it.I can't 13 　 why people drop litter.But I will keep picking it 14 　 they stop dropping it.I know I am only doing a small bit to help 15 ndline,but I still think it is important.

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Today's young people are taking a more active part in online activities．Although the Internet can be 1 　 for students to collect information and communicate(交流) with their friends，teachers and parents are becoming more and more 2 　 about the unheahhy web content(网上内容) in the bar．They think that the birth of“Harm-free Internet Bars”(健康网吧) is 3 　 step to 4 　 teenagers．

　　It was Sunday afternoon and there were not many 5 　 seats left in the Feiyu Internet Bar．A few 6 　 werefound playing 7 ndline．A person of the bar was walking around 8 　 Internet users' online activities．

　　“My job is to find anyone who is looking at 9 　 websites and then 10 　 them from doing so，”he said．“This is a 11 　 of the Harm-free Internet Bar' project．”Feiyu，a famous Internet bar in Beijing is among the first 19 to 12 　 the harm-free Internet bar club．

　　In order to help start a better 13 　 for teenagers' online activities，China's Communist Youth League has brought out the program named“Harm-free Internet Bar for Teens”．But while teachers and parents 14 　 the“harm-free Internet bars”．15 　 do many school students think of them?

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