从下面方框中选出恰当的词或短语放入短文相应的空格处,使短文语句通顺意思完整。其中有两项是多余的,将所选词的代号写在题后对应横线上。
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Thomas Edison lived in America. He invented plenty of electrical appliances (电器)and 1 people know him.
At that time there was no electric lamp (电灯) in the world. And it brought people 2 . Young Edison decided to 3 it. He didn’t know which material was suited to be a lamp filament (灯丝). He 4 many times and he spent a lot of time on it. Some friends of his asked him to 5 the experiments but he didn’t listen to them and tried his best to find the 6 .
One afternoon a friend of his came to visit him. He was doing his experiment in the lab 7 the man came in. But he only asked his friend to 8 and didn’t stop to talk with him. The man sat for a long time and Edison said nothing to him. He was 9 Edison and said. “You’ve done the experiments 1,200 times but you’ve failed 1,200 times.” “You’re right, my friend,” Edison went on doing his experiments and said, “But I have known that 1,200 materials 10 to be a lamp filament.”
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