The World Expo 2010 is being held at a time the world is looking for a new kind of balance between nature and cities．
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A
when
B
where
C
which
D
that
推荐题目
____ puzzled the mother most was ____the son would never agree with her.
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A
What; why
B
That; how
C
Which; when
D
What; where
I was born in New Orleans, Louisiana, a city ______ name will create a picture of beautiful trees and green grass in our mind.
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A
which
B
of which
C
that
D
whose
---So you were in the supermarket __________ you heard a strange sound, right?---That’s true. I ran out as quickly as possible.
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A
when
B
while
C
then
D
which
When ______ help, one often says “Thank you.” or “It’s kind of you.”
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A
offering
B
to offer
C
to be offered
D
offered