單項(xiàng)選擇題It was well known that Thomas Edison（）the electric lamp.

A.invented 
B.discovered
C.found
D.developed


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1.單項(xiàng)選擇題It was in（）the American astronauts succeeded in landing on the moon.

A.when
B.the moment 
C.which 
D.that

2.單項(xiàng)選擇題It was a great pleasure（）me to be invited to the party.

A.for 
B.on 
C.to 
D.of

3.單項(xiàng)選擇題It is not always easy to tell the right（）the wrong.

A.from 
B.with
C.than 
D.to

4.單項(xiàng)選擇題It is not always easy to tell the right（）the wrong.

A.from  
B.with  
C.than  
D.to

5.單項(xiàng)選擇題It is high time we（）something to stop road accidents.

A.did 
B.are doing 
C.will do 
D.do