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.
Điền vào số 3
A. saved
B. spent
C. cost
D. estimated
Đáp án C
Giải thích: động từ điền vào phải mang nghĩa tiêu cực. Cấu trúc cost sb st (làm ai tổn thất cái gì).