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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Mark drives his car too fast and, what's more, very carelessly, ________ worries his mother.
#78621
A
a
B
what
C
it
D
which
I think I have reached the point, I enjoy seeing the scenery of the city.
#78695
A
When
B
Where
C
Which
D
that
With the help of the collected money, subways can be built sooner and better, _______ brings convenience to citizens.
#78676
A
as
B
what
C
who
D
which
I have a big dream — I want to go into space, _______ will take some time to realize, I guess.
#78626
A
which
B
it
C
what
D
where