More and more Americans are going to work by bike. Do you know why more people are 41 bikes to work? We can answer the question in 42 ways. First, bikes don’t need gasoline (汽油), so it takes 43 money to use them. Second, a bike doesn’t 44 much space (空间), so it is 45 to find a                   place for it. And riding a bike is good for one’s 46 . People often drive their 47 to offices or to shops, but now people think riding bikes is a good way of doing sports. That’s 48 more Americans are now riding to work 49 bike, and they are 50 their own cars at home. 小题1: A．making B．riding C．jumping D．believing 小题2: A．popular B．different C．famous D．friendly 小题3: A．less B．more C．much D．many 小题4: A．mend B．need C．have D．find 小题5: A．easy B．hard C．cheap D．expensive 小题6: A．journey B．health C．study D．work 小题7: A．buses B．trains C．cars D．boats 小题8: A．what B．why C．how D．where 小题9: A．by B．on C．at D．in 小题10: A．cleaning B．leaving C．staying D．learning