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11. You _____ have watched TV for hours, it is a strain for your eyes.
a. shouldn’t b. should c. might

12. You _____ to do this task on time.
a. may b. have c. can

Образуйте независимый причастный оборот. (13-17)

13. The power station _____ in our region will run on local coal.
a. was built b. being built c. be built

14. The current _____through a conductor, a magnetic field is set up.
a. flowing b. flows c. have flown

15. The engine _____ , the operator started it.
a. is tested b. was testing c. having been tested

16. A sensitive receiver _____, the electric oscillations could be detected successfully.
a. are built b. having built c. having been built

17. Other factors _____ constant, the current is known to be directly proportional to conductivity.
a. be b. being c. having been


Образуйте инфинитивную конструкцию. (18- 20)

18. Communication _____ to have no limits nowadays.
a. is supposed b. is supposing c. was supposed

19. The input and output units _____ to be the necessary components of a computer.
a. knows b. are known c. will know

20. We know the current_____ a flow of electrons.
a. is b. was c. to be

21. If the operators had used some additional components, they_____able to actuate the relay.
a. will be b. would be c. would have been

22. If we _____ this new system of computation, we would make maximum use of the automation principle.
a. used b. would use c. had used