1)Though simple electric and magnetic phenomena ………… since ancient times, most basic laws of electricity were discovered between 1784 and 1831. a) was known; b) have been known; c) have known2) After the text about the advantages of electricity………… the students went on reading about the application and consumption of electricity.a) had read; b) had been read; c) has been read3) We………… the resistance in each case before we begin to carry out the experiment.calculate; b) will have calculated; c) will calculate4) During the autumn of 1831 M. Faraday established the scientific foundation from which our electrical age ………….a) has developed; b) has been developed; c) developed5) He assumed that for many years the only practical electric invention made by B. Franklin …………. the lightning-rod.a) had been; b) has been; c) was6) In 1825 Sturgeon …………. the first electromagnet, the device in which magnetism was generated by an electric current.a) exhibited; b) was exhibited; c) had exhibited7) They claimed that the battery was one of those devices that………… more than once.a) has been invented; b) had invented; c) had been invented 8) Scientists believe that by the end of the 21-st century the whole mankind…………with the new kinds of energy.a) will be provided; b) will have been provided; c) will have provided9) Electricity has provided mankind with the most efficient source of energy. No other source of energy………… so widely used as electricity.a) have been; b) was; c) has been10) M. Faraday discovered electromagnetic induction which led to the development of the electric dynamo and motor. He ………… lots of experiments before he published the results.a) has made; b) made; c) had made