They haven't paid for their tickets,have they?-----_____.The

They haven't paid for their tickets,have they?-----_____.The They have bought their piane tickets. They have never seen the man before,haven't they? They haven't touched the surface of their potential. 2)They must have arrived by now,haven't they?为什么是haven't the They haven't decided on the place for skiing.=They haven't d They haven't finished their work.Maybe they have some troubl they haven’t packed their suitcast should children get paid for what they have done for their f they have to study a lot,_____?A.don't you B.haven't they They haven't lived here for very long.They can't _____ many They are waiting for their father _____(have) supper.