—How long has John been here? — Two years, _______ he still has no friends.
#56711
A
and
B
so
C
but
D
or
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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