The first electronic computer (26. build) ................... at the university of Pennsylvania in 1946. Although the computer looked like machines built in the 19th century. Computers were sold commercially for the first time in the 1950s, and a lot of progress (27. make) ................. sice then. Computers are now much smaller and more powerful, and they (28. can/ buy) .....................much more cheaply.
Computers (29. use) ............................. in many fields - in business, science, medicine and education, for exsmple/ They (30. can/use) ...................... to forecast the weather or control robots which make cars. The computer's memory is the place where information (31. keep) ...................... and calculations (32. do) .......................
The first electronic computer (26. build) ........WAS BUILT........... at the university of Pennsylvania in 1946. Although the computer looked like machines built in the 19th century. Computers were sold commercially for the first time in the 1950s, and a lot of progress (27. make) ....WAS MADE............. sice then. Computers are now much smaller and more powerful, and they (28. can/ buy) ......CAN BE BOUGHT...............much more cheaply.
Computers (29. use) .........ARE USED .................... in many fields - in business, science, medicine and education, for exsmple/ They (30. can/use) ........CAN BE USED.............. to forecast the weather or control robots which make cars. The computer's memory is the place where information (31. keep) ......IS KEPT................ and calculations (32. do) ..........ARE DONE.............