Pierre Curie ______ his own research work and joined Madam Curie in the search for radium.    
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A
turned down
B
gave off
C
set aside
D
took over
推荐题目
His mother _____ teacher. 
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A
became
B
has turned
C
came
D
proved
He left school early, and as an adolescent, determined ______  in South American, set off from his home.
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A
having a fortune
B
making his fortune
C
to spend a fortune
D
to make his fortune
I overslept this morning because my alarm clock ______.
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A
didn’t go out
B
didn’t let out
C
didn’t go off
D
didn’t let off