--- Mr Wu, could you tell me ________?--- You’d better do more speaking.
I think it’s unusual thing to find a UFO.
The young lady________ is talking with our teacher comes from America.
Waste paper mustn’t _______. We should keep our environment clean.
Come on! You will catch up with others _______ you work hard.
Jack runs ______of all in the sports meeting. He is good at running.