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
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They can find whatever they need in the supermarket, ______ is always busy on Sundays.
#78638
A
which
B
when
C
where
D
who
Mark drives his car too fast and, what's more, very carelessly, ________ worries his mother.
#78621
A
a
B
what
C
it
D
which
Huang yong wasn’t admitted into Qinghua University, _______ made his parents and him disappointed.
#78699
A
that
B
which
C
what
D
this
Jason will never forget about his 18th birthday, saw his being admitted to Harvard.
#78725
A
when
B
which
C
that
D
it