Mary said she ______ to school the next Sunday.

The policemen caught the thief, but he on the way to the police station.

Mother’s Day is coming. I’ve no idea______________for my mother. –Hmm, maybe you can do the housework.

Li Ping,what are you doing now? Why is the room_________smoke?[ ]

We work together to achieve our common purpose: __________ world that is safer, cleaner and healthier than __________ one we are living in.