Lucy and her friend__________at the airport in half an hour.They are going to Taiwan.
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
— Who taught ________ Japanese ? — I learned it by _________. A. you ; myself B. your ; me C. yourself ; myself