--- Which do you prefer, tea____________  coffee?---Tea, please.
#56391
A
but
B
so
C
or
D
and
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Don’t stop working _____ twelve. 
#58157
A
to
B
at
C
when
D
until
     he is ill,       he goes to school.
#56207
A
Although ; but
B
/,/
C
Although ;/
D
But; although