If you work really hard, you will get grades next year.
A. bad B. good C. many
—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