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　　Since the beginning of time, man 　　1　　 many interesting things．Some of these inventions, 　　2　　 numbers, the alphabet and the radio, have certainly changed history．

　　One of the most important 　　3　　 has been the computer since 1946．It changed all our lives．

　　The first computer 　　4　　 at Harvard University in 1944．It was as large as a room and quite difficult and slow to operate．But since the invention of silicon(硅)chip, computers have become smaller, easier 　　5　　, and faster to operate．Some computers are as 　　6　　 as television sets．Simple computers can be made smaller than a book．And computers are getting smaller all the time．

　　There are several reasons why computer is useful to us．First, it can store(储存)very, very large amounts of information in its memory chips．　　7　　, the computer can operate very quickly．　　8　　 times faster than humans and it will never feel tired．Third, modern computer can be built into other kinds of machines, like radios, cars, and planes．They can do a lot of work for us．

　　Soon, almost everyone, either at home 　　9　　 at work, will use some kind of computer．The lives of all of us 　　10　　 by this invention．

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The weather in our town today is different from that many years ago．It was too hot at the time．Now it becomes 　　1　　 because all the mountains around our town 　　2　　 trees．There is no more sand on the surface of the earth 　　3　　 these new trees．At the beginning of this century, sand was 　　4　　 here．　　5　　 we couldn't 　　6　　 any plants in this poor land．In 1952, a number of young people came to live here．They wanted 　　7　　 this poor land with their hands．They worked hard to plant trees to stop earth 　　8　　 sending away．After many years of hard work, a beautiful new town 　　9　　 on the poor land．Now, people on this town still go on planting more trees all the time．They want to keep it much more beautiful later 　　10　　．

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