1. for information it must be attached to a radio – frequency carrier wave. a. to be transmitted b. will be transmitted c. transmitted 2. various installations to transform electric power into mechanical and heat power. a. have been used b. are using c. are being used 3. the experiment to be continued . a. reports b. is reporting c. is reported 4. a computer to possess four main parts. a. has been known b. is known c. knows 5. the atmosphere to extend several hundred kilometers above the earth. a. proves b. has been proved c. is proved 6. transistor batteries to be great use in systems that have to operate on weak signals, for example, in ultra-long-distance space communications. a. expected b. have been expected c. were expected 7. materials very high resistance are called insulators. a. having b. have c. are having 8. a cable conduit is an arrangement in the ground. a. building b. is built c. built 9. calculations, a computer displays results. a. having performed b. performed c. performing 10. a faulty cable between two manholes is to be replaced. a. having run b. running c. runs 11. under different conditions, the devices were put to use. a. having been tested b. testing c. tested 12. the device faulty, one cannot rely on its readings. a. is b. being c. to be 13. ram stands for random access memory, information into and out of any single byte of memory. a. being transferred b. transferred c. have transferred 14. other factors constant, the current is known to be directly proportional to conductivity. a. be b. being c. having been 18. a barometer is used for the atmospheric pressure. a) measuring b) measures c) measurement 19. is any metal capable of into a wire. a) drawing b) being drawn c) having drawn 20. we know the atmospheric pressure as attitude increases. a) decreases b) is decreasing c) to decrease 21. quantum electronics it became possible to produce clock that measure time with an accuracy of one second per 300 years. a) having been developed b) have been developed c) being developed 22. without the sun there no light, no heat, no energy of any kind. a) will be b) would be c) will

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