Jack doesn’t smoke now, but he _______ for almost twenty years.
A．was smoking B．had smoked C．has smoked D．smoked
The manager says he really can’t ______to wait another day, because he is so busy.
A．afford B．waste C．spend D．cost
______ of danger in the street at night, she had to go home, with a friend _____ her.
A．Warned ; accompanied B．Warning; accompanying
C．Having warned; accompanied D．Having been warned; accompanying
Private cars are required to take turns off roads one out of five weekdays ___the traffic pressure.
A．relieve B．relieving C．torelieve D．relieve
_______ I accept the gift or refuse it is none of your business.
A．If B．Whether C．Even if D．No matter when
John once worked in a remote mountain village school, which is ______ only on foot.
A．accessible B．acceptable C．available D．appropriate
