单项选择题A.He thought it was better to learn it at college than at work.B.He decided it was a waste of money and time to learn to drive.C.He agreed that they could learn to drive.D.He thought they would spend three times more time to learn to drive than usual.
单项选择题A.When descending from a higher position.B.When tailing to go after its food.C.When propelling itself towards its food.D.When being taken by tides and currents.