It’s important __________ us students _______ carefully in class.
#47016
A
for; listening
B
of; listen
C
for; to listen
D
of; to listen
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It was ______ in the exam that ______ how much time I had wasted. 
#85029
A
not until I failed;I realized
B
until I failed; I didn’t realize
C
not until I failed; did I realize
D
until I failed; I realized