I usually do my homework after dinner until 10 pm, ______ is my bedtime.
#78678
A
who
B
what
C
which
D
that
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I was given three books on cooking，the first ________ I really enjoyed.
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A
of that
B
of which
C
that
D
which
My neighbors used to give a hand in time of trouble, was very kind of them.
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A
who
B
that
C
what
D
which
Look! The dictionary , _____is red , is a birthday gift given by Father.
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A
which cover
B
the cover of which
C
the whose cover
D
that the cove
Now everyone is concerned about how to conquer the economic crisis, __________is very important for us to preserve our standard of living．
#78697
A
which success
B
its success
C
the success of which
D
the success of it