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   Inventions change our lives. Lots of inventions are very _____. They can make our lives better and easier. Tomas Edison was an American inventor and a _____. He had more than 1,000 inventions in his life. Light bulb (电灯泡) is one of the greatest inventions. Without it, we will be living in the dark world, or we will have to _____ up fire or candles. When Edison was little, he always asked some strange _____. His mother taught him by herself. Before he inventing the light bulb, he read lots of books and made experiments a lot. Finally he made great success. The secret (秘密) to success is _____ work.