、The virtues of thrift（节俭）and hard work is vital for everyone, is often the case in any society.
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as
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that
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when
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I think I have reached the point, I enjoy seeing the scenery of the city.
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When
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Where
C
Which
D
that
The number 9.11 is a special number, , I think, that will be remembered by the Americans forever.
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what
B
it
C
which
D
one
When deeply absorbed in work, _____ he often was, he would forget all about eating or sleeping.
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that
B
which
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where
D
when
Mark Twin wrote many popular novels in his life, ________ The Adventures of Tom Sawyer is a best example.
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of which
B
what
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whose
D
which