which, smaller, ago, which, make, where, much, many, what, sold\ The first worlds computer was built at University of Pennsylvania in 1946, although computer-like machines were built in the 19th century. Computers were ........................... (1) commercially for the first time in the 1950s, and a lot of progress has been made then. Computers are now much ........................... (2) and more powerful. Computers are used in ........................... (3) fields – in business, science, medicine, and education. They can be used to forecast the weather or to control robots ........................... (4) make cars. The computer’s memory is the place .......................... (5) information is kept and calculations are done. A computer cannot think for itself. It must be told exactly ....................... (6) to do. A lot of difficult calculations can be done very quickly on a computer. Computers don’t ........................... (7) mistakes. Stories are heard sometimes about computers paying people too........................... (8) money or sending them bills for things they didn’t buy. These mistakes are made by programmers. Some years ........................... (9), an American computer-controlled rocket went out of control and had to be destroyed. The accident was caused by a small mistake in one line of the program, ........................... (10) cost the USA 18 million dollars. Criminals have found that computer crimes are a lot easier than robbing banks. Hundreds of millions of dollars are stolen from business every year by people changing the information in computers.