The invention of steam engine greatly sped up the industrial revolution, which _____ a lot to the take-off of the world. 
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A
led
B
contributed
C
constructed
D
exposed
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 It is known to us that lions and tigers ________ the cat family.
#71242
A
are belonging to
B
belonged to
C
belong to
D
are belonged to
Jack, have you ____ your mid-term examination?
#77066
A
finished
B
passed through
C
got through
D
succeeded to pass