(2013·哈尔滨四校高三统一检测)The old man often looked back on the past days ________ he worked hard to make a living.
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which
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when
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where
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that
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The old professor has three sons，________are doctors.
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all of them
B
all of whom
C
all of that
D
all of which
- Was it because of his laziness_______ he didn't do the experiment successfully?- No, it was because of his carelessness.
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that
B
while
C
for
D
as
Come on! The man in charge of the job ___ you have to explain everything is waiting.
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A
who
B
about which
C
to whom
D
where
Nowadays people are more concerned about the environment _______ they live.
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A
what
B
which
C
when
D
where
University graduates should develop such skills as critical thinking, and inter-personal communication, ________ are important in personal development.
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A
which are believed by the manager that
B
which are believed by the manager
C
which the manager believes that
D
which the manager believes