【2012山东德州】I enjoy fresh air so I always sleep with the window open _____ it is really cold.
| A．unless | B．when | C．if | D．since |
Li Na plays __________ tennis very well. She has become __________ first Asian woman to
reach a Grand Slam（大满贯）final.
| A．a, the | B．/ , the | C．the, a | D．/ , a |
—Could you tell me_____________?
—Certainly. In half an hour.
A. when the high speed train will arrive
B. when the high speed train arrived
C. if the high speed train has arrived
—Are you going to but a new camera?
—Yes. But there are so many cameras that I can’t decide______________.
A. how to use B. where to sell C. which to buy
—Shall I take a taxi?
—No, we_____________. It’s not far from here.
A. shouldn’t B. mustn’t C. needn’t
—Oh, my God! I can’t find my key to the office.
—Don’t worry. Perhaps it______________ in your home.
A. left B. has left C. was left