阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。(满分15分)

Imagine a road crossing without the three-day traffic signal, cars, trucks, school buses, bicyclists and students walking to school would try to rush through the crossing【小题1】 the same time. Their safety would be in danger.

Thanks to an African American【小题2】 (invent) named Garrett Augustus Morgan, we have three-way traffic signals that help make crossings much【小题3】 (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【小题4】 (opportunity). Living in Cincinnati, Ohio, he continued his studies in English grammar. Then he moved on to Cleveland【小题5】 he worked as a repairman for a clothing factory. He had a keen interest in solving problems 【小题6】 (meet) in everyday life. Later he patented several inventions. The three-way traffic signal was just one of 【小题7】. One day he felt very sad when he saw a traffic accident. To help reduce traffic accidents and save people’s lives, he 【小题8】 (immediate) began to work on the invention. Finally, it was 【小题9】 great success which saved lives then, and 【小题10】 (be) still saving lives today.