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　　There are all 1 of machines. They 2 in many different ways. 3 kind of machine 4 computer (计算机). A computer can do 5 . A computer can do arithmetic (算术). People can do arithmetic, but they cannot do it 6 a computer.

　　Computers remember things. Computers remember 7 people tell them. People cannot remember as 8 things as computers. Computers help tell 9 the weather will 10 . Computers help fly rockets (火箭) and spaceships.

　　These are 11 of the ways computers are used. They are used in 12 of places. 13 they are not always used the 14 way. Some computers do just 15 things. Some computers can do 16 things. There are 17 computers. There are big computers.

　　There 18 computers in your school. Can you 19 what they 20 ？

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In the universe,there is the earth,the moon,the sun,the stars and all the other things too far away to see.The earth is one of the sun’s  1  ,and the moon is our satellite.The moon is about three hundred and eighty thousand kilometers away 2   the earth ,but it’s our 3 neighbor in space.It 4  more than three days to get there by spaceship No man 5  fathar than the moon ,but spaceship 6  people has reached other planets.

Of  7   the stars ,the sun is the nearest to the earth  8    other stars are even bigger and brighter than the sun.They look small only 9  they are much farther away.You 10  see them in the daytime .But if you go out at night ,you’ll be able to see many of them.