Between the lectures is a 20 minutes’break，__________the students can get relaxed.
#75419
A
that
B
which
C
where
D
when
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The old professor has three sons，________are doctors.
#76978
A
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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A
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.
#76369
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