You must work hard, _____ you will fall behind.
A．and B．but
C．so D．or
The war was over about three months ago, _____the American soldiers in Iraq are still having a lot of trouble to deal with.
A．or B．and
C．but D．so
—Can you play football?
—Yes, I can, I can't play very well.
A．or B．and
C．so D．but
Mr. Brown knows little Japanese, he can't understand the instructions on the bottle of the pills.
A．so B．or
C．but D．for
Stand over there, ______ you’ll be able to see the oil painting better.
A．but B．till
C．and D．or
He found it increasingly difficult to read, ______ his eyesight was beginning to fail.
A．though B．for
C．but D．so
