Safety in school has been of great concern because of the frequent reports ____ students got injured or killed while in school.
#68557
A
where
B
when
C
which
D
that
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The road conditions there turned out to be very good, ___ was more than we could expect.
#71771
A
it
B
what
C
which
D
that
The river, _______the bank are covered with trees, is very long.
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A
whose
B
which
C
of which
D
which of
Our teacher is always busy preparing lessons until 11 o’clock at night, ______we students have gone to sleep.
#74335
A
that time
B
by which time
C
by that time
D
which time