Be careful with your machine, you'll be hurt.
A．and B．but
C．or D．so
Lily Lucy may go with you because one of them must stay at home.
A．Not only; but also B．Neither; nor
C．Both; and D．Either; or
— Will you come on Monday or Tuesday?
— I'm afraid day is possible. I'll be busy next week.
A．either B．neither C．both
Work hard, you're sure to be successful in this exam.
A．and B．or
C．but D．so
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
