---Have you seen Dr. Adams recently?---No. He __________ Hong Kong for an important meeting. He’ll come back tomorrow.
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.
Pleasetellme______.Ihavesomegoodnewsforhim.