单项选择题
A．buses are always available in 24 hours B．bus riders have to buy monthly passes C．bus fare is paid by exact change in coins D．buses are the best means of transportation
A．at bus stations B．at local banks C．in any bookstores D．from the ticket offices
A．get the food ready before the guests arrive B．keep the guests away from the kitchen C．spend some time with the guests D．accept the guests’ offer to help