We discussed the high rate of single parent family, and wondered how to explain this ______.  
#7118
A
condition
B
state
C
situation
D
phenomenon
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He asked Mary whether she had passed the exam ________.
#6452
A
yesterday
B
the day before
C
the day ago
D
before the day
The new safety regulations were agreed on after _____ with the work-force.
#6919
A
conference
B
participation
C
intervention
D
consultation