The world’s first computer was made at the University of Pennsylvania of Pennsylvania in 1946 although computer- (31)___________. Computers were sold commercially for the first time in the 1950s. Computers now are much smaller and more powerful, (32)_________  

   Computers are used in many fields (33)________. They can be used to forecast (34)_______, which makes car. Many home computers have been sold recently. People know more about computers than they used to. Computer help us in our work and they are playing a big part in our life.

A. in business, science, education and so on

B. and they can be bought much more cheaply

C. like machines were built in the nineteenth century

D. the weather and to control robots

31.______

32.______

33.______

34.______

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