The Education Department says that school safety has set off alarm bells with frequent reports of serious accidents ________ students got injured or killed.
#66900
A
after which
B
in which
C
by which
D
for which
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The clever boy made a hole in the wall, _______ he could see _____ was going on inside house. 
#73752
A
which; what
B
through which; what
C
through that; what
D
what; that
Written in a hurry, __________________ .
#69420
A
they found many mistakes in the report
B
he made lots of mistakes in the report
C
there are a lot of mistakes in the report
D
the report is full of mistakes