Complete the following passage then answer the question
Hard known interest telephone
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Alexander Graham Bell is widely(1)......as the inventor of the first telephone.he was born on Match 3,1847 in Edinburgh,Scotland.When he was 23,Bell emigrated to Canada with his parents and the next year moved to the United States to teach deaf mute children. He took great(2).......in transmitting the human voice. With his colleague Thomas Watson,bell worked very(3)...... on the experimentation to invent devices such as the harmonic telegraph and phonautograph.The fist(4)......communication was said to have ...