Edison often said, “1 will discover what the world needs, then I will try to invent it.”  It is true that he did more than any other man of his time in inventing things. He made more than one thousand inventions in his life and all these have changed our way of living. Edison was one of the greatest inventors in the world. When Edison died in 1931, someone said people should turn off all the lights in their homes, streets and factories for several minutes in honor of this great man. Of course it was impossible to do so. And this shows what Edison's inventions mean to people's life.
All the things Edison invented were _________ people needed at that time.

A．what

B．that

C．then

D．which

Edison _________in inventing new things.

A．took all his time	B．paid all his money
C．spent his most time	D．spent his most money

Edison had _________ inventions in all his life.

A．thousands of	B．over one thousand
C．only one thousand	D．less than a thousand

Edison was dead for nearly _______ years.

A．fifty

B．severity-six

C．sixty

D．eighty

It was __________ to turn off all the lights in honor of the greatest inventor.

A．possible

B．not true

C．nice

D．important