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．