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    The computer began as a calculating machine in 1642 in France. Then in 1822, it was

built 1.______ an analytical machine, which 2.______ instructions from cards with holes.

In 1936 Alan Turing wrote a book 3.______ (describe) how computers could 4.______ (make)

to work,and built a "universal machine" 5.______ (solve) any mathematical problem.

    At the beginning, the computer was huge, the 6.______ of a large room. 7.______ years

go by, it becomes smaller and smaller, especially 8.______ it got new transistors in the

1960s, it has become smaller and smaller, and 9.______ artificial intelligence, it is

getting cleverer and cleverer, quicker and quicker.

    In 10.______ early 1960s, computers could be connected by a network, 11.______ enables

their users 12.______ information with others and talk to each other. Since computers

13.______ into people's homes, computers are used by billions of people 14.______

information and communicate with each other around the whole world by the 15.______.