Electricity is such a part of our everyday lives and so much taken for granted nowadays (31)__________ we rarely think twice when we switch on the light or turn on the radio.At night,roads are brightly lit,enabling people and (32)__________ to move freely.Neon lighting used in advertising has become part of the (33)__________ of every modern city.In the home,many (34)__________ devices are powered by electricity. (35)__________ when we turn off the bedside lamp and are (36)__________ asleep,electricity is working for us,(37)__________ our refrigerators,heating our water,or keeping our rooms air-conditioned.Every day,trains,trolley-buses,and trams take us to and from work. We rarely (38)__________ to consider why or how they run (39)__________ something goes wrong.　　In the summer of 1959, something (40)__________ go wrong with the power plant that provides New York with electricity.For a great many hours,life came almost to a (41)__________ .Trains refused to move and the people in them sat in the dark,(42)__________ to do anything; lifts stopped working,so that (43)__________ you were lucky enough not to be (44)__________ between two floors,you had the unpleasant task of finding your way down (45)__________ of flights of stairs.Famous streets like Broadway and Fifth Avenue in an (46)__________ became as gloomy and uninviting (47)__________ the most remote back streets. People were afraid to leave their houses,(48)__________ although the police had been ordered to (49)__________ in case of emergency,they were just as confused and (50)__________ as anybody else.