The woman was in that hotel before she came here.
—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
—Alice, would you mind not playing the guitar? I ___________on the phone. —Oh, sorry, mom. A. talked B. was talking C. am talking
—Doctor, ____________should I take this medicine? —Twice a day. A. what time B. how much C. how often