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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

11. a. shouldn’t 12. b. have 13. b. being built 14. a. flowing 15. c. having been tested16. c. having been built17. b. being 18.a. is supposed 19. b. are known 20. c. to be21. c. would have been22. a. used