–Did you ask the guard what happened?--Yes, he told me all ______ he knew.
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about which
B
which
C
that
D
what
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Now there’s a system _________ the waste is disposed of using the principles of ecology.
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A
when
B
which
C
that
D
where
Workers built shelter for survivors, _________ homes had been destroyed.
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which
B
whose
C
of whom
D
that
Here are some Christmas presents, ____you can choose one for yourself.
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in which
B
from which
C
between which
D
through which
They've won their last three matches, ______ I find a bit surprising actually.
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A
that
B
when
C
what
D
which
Many countries are now setting up national parks _ animals and plants can be protected.
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A
which
B
whose
C
when
D
where