He made another wonderful discovery, _______ of great importance to science.
#76099
A
which I think
B
which I think it
C
which I think is
D
I think which is
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If the machine makes a mistake -- ____ rarely happens -- it gives a warning in the form of a red light.
#77412
A
that
B
which
C
as
D
what
Everyone has a stage in their life ______ they seem to have trouble in everything.
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A
where
B
when
C
that
D
why
At the class meeting, he made two suggestions, ______ were of great value.
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A
all of them
B
all of which
C
both of them
D
both of which
She’s in a hopeless situation, _____ we will keep a very close eye on.
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A
where
B
when
C
which
D
that
The hurricane and the damage ___________ caused have done much harm to the United States.
#77565
A
that
B
it
C
what
D
when