... broadcasts in the United States began in 193 9, but television did not reallybecome (9) ___________ until later the Second World War. Between 194 5 and 195 5 there were rapid (10) ___________ in ... By 192 3, Vladimir Zworykin , a Russian, had invented a camera tub that could turn pictures into electric (7) ___________ . By 192 9, Zworykin had built a television system that work. By 193 5, ... Ethel Lee from Leicestershire in England. She was 99 years old when she (48)______ from Heathrow on 24 February 198 5.Each Concorde is built at a ( 49) ______ of £55 million. Twenty have been built...