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Soon the beginning of time, man has invented many__1__things. Some of them, like numbers, the alphabet and the radio, have__2__changed history.
The first computer__3_ at Harvard University in 1944. It was as large as a room and quite__4_ and slow to operate. __5__ since the__6__ of the “silicon chip”, computers have become smaller, easier to use, and__7__ to operate. Some computers are as small as television sets. Simple computers can be__8__ smaller than a book. And computers are_9__ smaller all the time.
There are several reasons why the computer is__10__ to us. First, it can store very, very large amount of information in its memory chips. __11__, the computer can operate very quickly---__12__ of times faster than a human---__13__ it will not feel tired. Thirdly, modern computers can be built into other kinds of__14_, like radios, cars, and planes. They can do a lot of work for us.
Soon, almost everyone, either at home or at work, will use some kind of computer. All our life will__15__ by this invention.