—____ do the students exercise a week? —Once or twice. A. How often B. Hong long C. How many times.
—Listen! Is Mary singing in the next room?—No. It _______ be Mary.She has gone to Shanghai for an important meeting.
.Hurry up, ________ you’ll not catch the first bus.
The old men in hospital ______________.
Beihai Park is a beautiful place that many people come to visit it every day.
The boys when the teacher came in. So she was very angry.