、The virtues of thrift（节俭）and hard work is vital for everyone, is often the case in any society.
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A
as
B
that
C
when
D
where
推荐题目
China's population is expected to increase to about 1.5 billion in 2040, ______it will start to decline slowly.
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A
where
B
which
C
on which
D
after which
I have a big dream — I want to go into space, _______ will take some time to realize, I guess.
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A
which
B
it
C
what
D
where
The teacher doesn’t believe his reason for being absent from class ___ he was ill, ____mad him sad.
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A
that ; which
B
why; which
C
why; what
D
that ;what
______ is known to us, the 16th Asian Games will be held in Guangzhou, China in November, 2010.
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A
As
B
It
C
Which
D
What
The worsening of global warming, _____human activities are to blame, has led to frequently extreme weather.
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A
by which
B
for which
C
that
D
what