— your mother know the boy in the car?—No, she .A. Do; don’t B. Does; doesn’t C. Does; does
Tina used to __________a round face.
It was difficult for the rich _____ a happy life.
We’ve walked for a long time.Let’s stop ____a good rest
A Wechat (微信) is an invention __________ can help people talk to friends, share photo, ideas and feelings freely.
_____ of the water _____ polluted. We must try to protect our environment.