The time he has devoted in the past ten years ________ the disabled is now considered ________ of great value.
#69205
A
to help;being  
B
to helping;to be
C
to help;to be
D
helping;being
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They_____the train until it disappeared in the distance.
#78551
A
saw
B
watched
C
noticed
D
observed
Mr. Green, who is a member of Labor Party, has _____ Mr Brown as President.
#83064
A
taken place
B
taken the place
C
in place of
D
replaced
How the big forest fire has          remains to be a mystery.
#66249
A
turned up
B
broken out
C
taken place
D
broken up