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　　Not all people like to work but everyone likes to play．All over the world men and women,boys and girls enjoy 　　1　　．Since the days of long ago,adults and children have called their friends together to spend 　　2　　,even days,playing games．

　　Sports help people to live 　　3　　．They help to keep people healthy and feeling good．When they are playing games,people 　　4　　 a lot．This is good for their health．Having fun with their friends makes them 　　5　　．

　　Many people enjoy watching others 　　6　　．In small towns,crowds(人群) meet to watch the bicycle races or the soccer games．In big cities,thousands 　　7　　 to see an ice-skating show or a baseball game．

　　What are your favorite sports? Is the weather 　　8　　 where you live? Then swimming is probably one of your sports．Boys and girls in China love to 　　9　　．There are wonderful beaches and there are beautiful 　　10　　 and lakes across the country．The weather is also good for swimming．

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　　Many people like to keep dogs as their pets．But do you know dogs were wild(野生的)animals long，long ago?

　　The 1 ndline　 wild dogs were trained by 2 ndline　 in Europe about 10,000 years ago．These first“dogs”were not like 3 ndline　 we have now．They may have been small wolves．These dogs often came near humans to 4 ndline　 some food．Some of the young dogs were adopted(收养)by people and grew up with them．

　　Humans believed the 5 ndline　 were a help to them in many ways．The dog helped them to hunt(狩猎)．They could smell and hear danger 6 ndline　 people could．They helped keep people 7 ndline　 on cold nights．So it was 8 ndline　 to raise the dogs．

　　Now，there are many different kinds of dogs 9 ndline　 they may look quite different from each other．Dog trainers think there are more than 400 different kinds in the world．The number keeps increasing with new kinds．

　　Since those early days，humans and dogs have always been together．We should 10 ndline　 them from now on because they are really our friends．

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　　In the 13th century, the famous Italian traveller, Marco Polo, travelled a long way to China．During his stay in China, he saw many wonderful things．One of the things he discovered was that the Chinese used paper money．In western countries, people did not use paper money until the 15th century．However, people in China began to use paper money in the 7th century．

　　A Chinese man called Cai Lun invented paper almost 2,000 years ago．He made it from wood．He took the wood from trees and made it into paper．He then put these pieces of paper together and made them into a book．

　　Now paper still comes from trees．We use a lot of paper every day．If we keep on wasting so much paper, there will not be any trees left on the earth．If there are no trees, there will be no paper．Every day, people throw away about 2,800 tons of paper in our city．It takes 17 trees to make one ton of paper．This means that we are cutting nearly 48,000 trees every day．Since it takes more than 10 years for a tree to grow, we must start using less paper now．If we don't, we will not have enough time to grow more trees to take the place of those we use for paper．

　　So how can we save paper?We can use both sides of every piece of paper, especially when we are making notes．We can choose drinks in bottles instead of those in paper bags．If the shop assistant gives us a paper bag, we can save it and reuse it later．

　　Everyone can help to save paper．If we all think carefully, we can help protect trees．But we should do it now, before it is too late．

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