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Thomas Edison was a great _______ inventor. When he was a child, he was always ________   questions and trying out new ideas. No matter________  hard it was, he never gave up.
Young Tom was in school for only three months. His teacher didn't understand why he had ________  many strange questions. Most of them were not about his lessons. The teacher didn't want to teach Tom any ________ . He asked Tom's mother to take the boy home. Tom's mother taught him to read and write, and she found him________  a very good pupil. He learnt very fast and became very________ in science.
One day , he saw a little boy ________ on the railway tracks at a station. A train was coming near quickly, and the boy was too frightened to move. Edison rushed out and carried the boy to________. The boy's father was so _______  that  he taught Edison to send messages by telegraph.