Tom can play the guitar, ______ he can’t play it ______. 
#55551
A
or, good
B
and, well,
C
but, good
D
but, well
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This problem is ______ difficult __________.
#57835
A
so; that few of us can do
B
so; that few of us can do it
C
too; for anyone of us to do
D
too; for anyone of us to do it
Don’t get off the bus _____ it has stopped.
#57377
A
after
B
when
C
if
D
until