-To keep safe, everyone_______ wear a seat belt(安全带) in a car.A. is suppose B. are supposed to C. is supposed to D are supposed
—What are you in? —I’m in Three. A.class, class B.class, Class C.Class, Class
—Must we keep the window _______ all the time? —No, you don’t have to.
We _______ play on this road. There is too much traffic.
The old man was _______ sad _______ say a word when he heard the bad news.
—Why do you like living in the countryside? —Because there’s _______ noise and _______ cars there.