Although he _______ the danger to his own health, he found it difficult to quit smoking.
#67042
A
was very aware of
B
well awared of
C
was well aware of
D
very awared of
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These doctors are busy day and night,        a cure for AIDS.
#70989
A
bringing on
B
pulling on
C
taking on
D
working on
Everyone should _______________ the environment.
#66667
A
make a contribution to protect
B
make contribution to protecting
C
contribute in protecting
D
make contributions to protecting