Thomas Edison ____ work on the railway when he was twelve, selling newspapers and snacks. There were long periods with nothing for him to do, so he ____ himself a little laboratory in the luggage van and ____ experiments there ,when he wasn’t selling things to passengers. He also ____ a library and ____ every single book in it. One day, when he ____ at a station, he noticed a small boy playing by the track, unaware that a train was approaching. Edison ran out and ____ the child just in time. The child’s father was so grateful that he ____ to teach Edison to be a telegraph operator. Edison accepted the offer and soon he was having regular lessons. After a year, he was good enough to get a job in the telegraph office. He continued to read and experiment whenever he had time. At twenty-one he ____ the telegraph office to devote all his time to being an inventor. He ____ to invent the electric light bulb, the phonograph and the movie camera.

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