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A lot of people find it useful to have a phrasebook when they travel to a country _____they don’t know the language．
#69433
A
where
B
when
C
why
D
which
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The companies are working together to create _________ they hope will be the best means of transport in the 21st century.
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John returned with two workers, with_______ help we finally got the car out of the mud.
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David is such a good boy        all the teachers like.
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__________ she couldn't understand was__________ fewer and fewer students showed interestin her lessons.
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According to the United Nations, an aging society refers to one ____ 10 percent or more of the population is over 60, or 7 percent or more is over 65.   
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C
which
D
that