Safety in school has been of great concern because of frequent reports about accidents _______ students got injured or killed while in school .
#93689
A
that
B
when
C
in which
D
for which
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Looking out of the window of my room, ___ a tall tree in the yard.
#93518
A
there was
B
there were
C
I saw
D
there stood
 We all think it most foolish ________ such a mistake .
#92392
A
for you making
B
of you to make
C
you to make
D
for you to make
The old couple have been married for 50 years and never      with each other
#93799
A
they had quarreled
B
they have quarreled
C
have they quarreled
D
had they quarreled