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Between the two periods of classes is a break, _______ we can have a short rest.
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A
then
B
where
C
when
D
which
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Is this the factory ________ he worked ten years ago?
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Many countries are now setting up national parks________animals and plants can be protected.                                                            
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The only thing __________ we should do now is try our best to prepare for the Academic proficiency test.
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