In American, a friend inviting you to a restaurant doesn't mean that he or she will pay for the meal ______ you are told ahead.
#55342
A
until
B
unless
C
although
D
if
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Bob is young, _______ he knows a lot. 
#58536
A
because
B
so
C
but
D
unless
Learn hard, or you _______ pass the exam.
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A
will
B
don’t
C
won’t
D
can