Computers cannot make mistakes. Stories have been heard sometimes about computers paying people too much money or sending them (1)_ for things they didn’t buy. These mistakes ae made by the programs. Some years ago an American computer-controlled rocket went (2) and had to be destroyed. The accident has been caused by a small mistake in one line of the program, which (3) the USA 18 million dollars. Criminals have found that “computer (4)_ are a lot easier than robbing a bank.” Hundreds of millions of dollars are stolen from businesses every year by people (8)____ the information in computers.

(2) ................

A. ahead of schedule

B. into the orbit

C. out of control

D. to some extent

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