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I think that something has to be done to stop the air from being polluted, ______ ?
#64578
A
doesn't it
B
don’t I
C
don't they
D
haven't they
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You must have read about Mark Twain long ago, ____?
#64615
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mustn’t you
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haven’t you
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       do you go to school, on foot or by bus?
#59983
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---____ levels does the game have? -Five.
#60287
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#64948
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isn’t she
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#60327
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