The world's first electronic computer (was built ) at the University of Pennsylvania in 1946, although computer-like machines (were used ) in the 19th century. Computers (were sold ) for the first time in the 1950s, and a lot of progress (has been made ) since then. Computers are now much smaller and more powerful, and they (are sold ) much more cheaply.
Computers (are used ) in many fields - in business, science, medicine and education. They ( are used) to forecast the weather or to control robots which build cars. The computer's memory is the place where information (is kept) and calculations (are done ).
A computer cannot think for itself - it (is told ) exactly what to do. A lot of difficult calculations (are done ) very quickly on a computer.
Large numbers of home computers (have been sold ) recently, especially in the USA and Britain. People know more about computers than they used to, and computers are playing a bigger part in our lives. Progress (is being made ) all the time. Many people believe we can look forward to the day when even household jobs like cleaning (will be done ) by computer-controlled robots.
