---Look at the glasses on the desk. Are they David’s?---They belong to him. I saw him go out with glasses just now.
—Have you mended your shoes, Bob? —Yes, I _________ them twenty minutes ago .
—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.