Mr Li is a swimming__________. He teaches the children how to swim.
Do you think _____ a football match tomorrow?
My sister is very lazy. She _________ helps my parents with housework.
Who listens _____, in your class?
--- What’s the use of this kind of fuel(燃料) ? --- It can make the train __________ fast.
—Must we finish the project in a month? —No, you _______. A. mustn’t B. needn’t C. can’t