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1) in stereo system two loudspeackers are used making the sound more real. 2)the plant built many years ago is now known in many countries. 3)electronics is a science dealing with vacuum tubes and transistors. 4)having become a vary important technological device laaserwill be more widely used in future. 5)being asked many difficult questions he could not answer all of them. 6)new forms of cooperation having been developed, economic relations among countries became closer. 7)if specially treated this material may be used in space technology. 8)any elements is charachterized by a certain number of protons, this number being the same as the number of electrons in the atom. 9)having been installed on the spaceship solar batteries convert sunlightinto heat. 10)the measurements being made accurately, we got precise results. 11)a functioning computer system combines hardware elements with software elements.