选词填空。 1 How often do you go to work ( by/on) foot? 2 How often do you travel ( by/on) train? 3 How often do you ( drive/ride) a car? 4 How often do you ( take/drive) a taxi home? 5 How often do you ( ride/take) the underground? 6 How often do you ( drive/ride) a bike to work?