Imaginearoadcrossingwithoutthethree-waytrafficsignal.Ca...

問題詳情：

Imagine a road crossing without the three-way traffic signal. Cars, trucks, school buses, bicyclists and students walking to school would try to rush through the crossing 61_______ the same time. Their safety would be in danger.

Thanks to an African American 62 ________ (invent) named Garrett Augustus Morgan, we have three-position traffic signals that help make crossings much 63________(safe). Mr. Morgan was born in Kentucky in 1877. He only received six years’ education. As a teen he left his family’s farm in search of better 64___________(opportunity). Living in Cincinnati, Ohio, he continued his studies in English grammar. Then he moved on to Cleveland 65 ________ he worked as a repairman for a clothing factory. He had a keen interest in solving problems 66________(meet) in everyday life. Later he patented several inventions. The three-way traffic signal was just one of 67___________. One day he felt very sad when he saw a traffic accident. To help reduce traffic accidents and save people’s lives, he 68__________(immediate) began to work on the invention. Finally, it was 69______ great success which saved lives then, and 70________(be) still saving lives today.

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