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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The weather turned out to be very good, was more than we could expect.
#78635
A
what
B
which
C
that
D
it
The Roman alphabet is a Greek invention, ______ is the marathon, a long distance race created in honour of a Greek soldier.
#78627
A
which
B
what
C
that
D
as
The astronaut did many experiments in the spaceship, ______ much help for knowing space.
#78666
A
which we think it is
B
which we think are of
C
of which we think are
D
I think which is of
Mark drives his car too fast and, what's more, very carelessly, ________ worries his mother.
#78621
A
a
B
what
C
it
D
which
The company ran into trouble when it tried to expand too quickly, _____ was that it was short of money.
#78668
A
some of them
B
most of which
C
one of them
D
part of which