Mr. Clarke works in a middle school. He likes reading and often 1 some books from the library. He 2 to the radio every morning and reads newspapers after dinner. So he knows much and teaches well. His 3 worship(崇拜)him very much.
Mike,Mr. Clarke's little son, is only nine. He also likes reading books. And he often asks his father some questions. But Mr. Clarke always thinks the boy is too young to understand so he chooses 4 ones to answer. Of course the boy is not satisfied(满意的)with it.
One day, Mike read something about the electric lights(电灯)and was 5 it. When his father told him to do some housework, the son went on thinking of it. He asked the father a few questions, and his father answered 6 .
Then his father said proudly(自豪地), "Fathers always know 7 than sons!"
The boy thought for a while and said, " 8 . "
"Oh? Why?"
Mike didn't answer but asked quickly,"Who invented(发明)the electric lights?"
"Thomas Edison. " answered Mr. Clarke.
"Why didn't his 9 invent them, then?"
Looking at his son,Mr. Clarke didn't know 10 to answer it.