There is a system ________the waste is disposed of using the principles of ecology.
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A
which
B
where
C
that
D
at which
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We talked about the things and persons _______ we remembered at school.
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A
which
B
what
C
whose
D
that
Bob is in a hopeless situation, ______ we will keep a very close eye on.
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A
which
B
where
C
that
D
when
As for friendship, remember that no time is ever wasted _______ makes two people better friends.
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A
what
B
that
C
when
D
as
Then moment _________ Mary will always remember is _________ Mr．Black gave her a lot of valuable advice on how to improve her writing．
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A
when; that
B
that; that
C
that; when
D
when; where
Rescuers are still searching for the other 19 missing miners, _______survival chances are small.
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A
who
B
which
C
whom
D
whose