After three years of preparation for the 2011 Xi’an International Horticultural Expo (西安园博)会），the city is presenting the world______ many people think is the green Special Olympics．
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that
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which
C
what
D
where
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Most birds find it safe to sleep in the trees, but ______ they have eggs or young chicks, they don’t use a nest.
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why
B
how
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where
D
unless
(2014·河南豫北三校联考)________is well known to everyone，I should say，is that a man becomes learned by asking questions.
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Who
B
It
C
As
D
What
(2014·兰州高三质检)Our country is developing at an amazing speed，which is________makes me feel so proud.
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why
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_____ maths is concerned, Tom is the best student in our class.
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s long as
B
s well as
C
s soon as
D
s far as
When astronauts return to the earth’s atmosphere, helicopters fly to________they would land, ready to collect them.
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what
B
where
C
which
D
that