Alexander Graham Bell was born in 1847 in Scotland, but when he was young , he always took care of his almost 61 (entire) deaf mother and he become 62 (interest) in helping deaf people,
63 led him to invent the microphone. He was 64 (curiosity) about things in his daily life. One day, when he did an experiment about telegraph, he came up with an idea 65 if sound waves could be reproduced in a moving electrical current, they could be sent along a wire. In searching to improve the telegraph, Bell invented the first telephone. Owing 66 his efforts, the telephone 67 (bring) us so much convenience since it was invented. Besides those inventions, Bell experimented with helicopter designs and flying machines, and he made great 68 (contribute) to the design of bridges. Although he is most often 69 (associate) with the invention of the telephone, he was indeed a continuing searcher after 70 ( practice )solutions to improve the quality of everybody's life.