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　　One day, Mother 　　1　　 Jack's shoes and said,“Jack, look at your shoes．How dirty they are!You must clean them．”

　　“Oh, Mother, but I cleaned them 　　2　　 yesterday．”said the boy．

　　“They are dirty now．You must clean them again．”

　　“I don't want 　　3　　 them today．Even if I clean them today, they'll be dirty 　　4　　 tomorrow．”

　　Jack's mother 　　5　　 a moment and said,“All right．Don't clean them then．”

　　In the evening, Jack 　　6　　 from school．He was very hungry．

　　“Mother．Give me something 　　7　　．”he said．

　　“You had your breakfast in the morning, Jack, and you 　　8　　 lunch at school!”his mother said．

　　“I am 　　9　　 again．”cried the boy．

　　“Oh, hungry?But if I give you 　　10　　 to eat today, you'll be hungry again tomorrow!”

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　　When you hear the word “scitentist”, what do you think of? Many people think scientist are people in clean white coats who work in labs．And some scientists do work in labs．But there are 　　1　　 scientist who work in woods and jungles．These scientists are called “animal behavior(行为)scientists”, and they study animals as they live in nature．

　　Why don’t these scientists catch animals and study them in zoos? The 　　2　　 is in the word “behavior”．Animals behavior scientists want to learn 　　3　　 animal behave in their wild homes．When animals live in cages(笼子)or in zoos, they do not act the same as they do when they are 　　4　　．They may fight 　　5　　 each other, or they may not eat, or they may not raise(抚养)their babies as they usually would．To see real animal behavior, scitentists must go where the animals 　　6　　．

　　So animal behavior scientists go into the jungles, the woods or the desert．There, their most important 　　7　　 are their eyes and ears．They watch and listen to the animals very 　　8　　．They write down everything that happened in notebook．　　9　　 they live near the animals, the scientists are careful not to frighten them．If the scientists are luncky, the animals will 　　１０　　 no attention to them．Then the scientists can see how the animals really live．

　　The behavior scientists hope what they’ve learned about animal behavoir can provide clues(提供线索)to help people learn to live together more happily．

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　　Christmas will come soon．The radio stations(广播电台) are playing Christmas music,and the stores 　　1　　 very busy．People are doing their Christmas shopping．Many families have got Christmas trees 　　2　　 their homes already．

　　At this time of the year people make or 　　3　　 presents(礼物) for their families．Lisa is going to buy a new book for her elder sister．Her elder sister likes 　　4　　．

　　Her families usually get together 　　5　　 Christmas Day．Her elder sister lives in another city far away,　　6　　 she always come by plane．　　7　　 is going to arrive on Christmas Eve．Then Lisa is going to put a 　　8　　 in the living room,and put the presents under the tree．They don't open them until Christmas 　　9　　．

　　They are very 　　10　　 to receive(收到) presents．

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