Завершите предложение

1. The main aim of using computers is ……..................... .
a) to do addition, subtraction, multiplication. b) to optimize the work of scientists, designers, managers. c) to use in home life to play games.
2. Simple computers can do ………............ .
a) addition, subtraction, division, multiplication. b) logical operations, such as making decisions.
3. Complex computers can do ……............… .
a) addition, subtraction, division, multiplication. b) logical operations, such as making decisions.
4. Accounting, billing by banks and operations in marketing ……............ .
a) can be quickly done without a computer. b) can’t be quickly done without a computer.
5. The main problem with the computer is ……............…. .
a) to hire highly qualified managers. b) to use them very seldom. c) to protect them from viruses and hackers.