完形填空。
Mr Green works in a middle school. He   1   a teacher. He likes reading and often   2   some books
from the library. He keeps   3   to the radio every day and reading texts after supper.So he knows much
and teaches   4  . His students like him very much.Mike, Mr Green's little son ,is only nine. He often reads
when his father is   5  . And he often asks him some questions. Mr Green always thinks he is too   6   
understand them and chooses   7  one to answer. Of course the boy is not satisfied (满意) with it.
One day, Mike read   8   about the electric lights and was   9  it. When his father told him to do some
homework, he went on thinking of the book. He asked his father  10  questions,and his father answered all.
Then the father said proudly, "Fathers always know  11  than sons!"
The boy thought for a while and said, "  12  !"
"Oh? Why?"
Mike didn't answer and   13  instead "Who invented the electric lights?"
"  14  ." answered Mr Green.
"Why didn't his father inwent them,then?"
Looking at his son, Mr Green didn'tknow  15  to answer!
(     )1.A.am
(     )2.A.buys
(     )3.A.listening
(     )4.A.well
(     )5.A.sleeping
(     )6.A.silly
(     )7.A.the easiest
(     )8.A.a newspaper
(     )9.A.surprised
(     )10.A.a little
(     )11.A.no
(     )12.A.Happily
(     )13.A.asked
(     )14.A.Washington
(     )15.A.when

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