Alexander Graham Bell was an influential scientist, engineer and ____(invent). He was born on March 3, 1847 in Edinburgh, Scotland. He is widely credited with the invention of the first telephone. Bell's mother and wife____(be)both deaf, which had an effect____his work.
When he was 23, Bell and his parents moved to Canada. Bell studied the human voice and worked with different schools for____deaf. He experimented with sound, working with sound, working with equipment used to send different____(message)and record sound. He worked on acoustic telegraphy(声报机)with an electrical designer ____(name)Thomas Watson.
On February 14, 1876, Bell and Elisha Gray, an American electrical engineer, both filed patents(申请专利)covering the transmission (传送)of sounds telegraphically. Finally, Bel____(give)the patent. A few days____(late), he succeeded in____(get)his telephone to work.
Bell improved the design and by 1886 more than 150,000 people owned telephones in the United States. He once said, “The day will come when the man at the telephone will be able to see the distant person to ____he is speaking.”