The bicycle is one of the simplest yet most useful inventions in the world. What is most surprising is that it was not ___1__ earlier, although the great inventor Leonardo Da Vinci had drawn pictures for bicycles and also for flying machines and some other things. Those things were not produced___2___ long after he died. A person riding a bicycle uses ___3___ energy to make the bicycle move, and there is no pollution at all when you are riding. Even so, in developed ____4___, most people don’t travel to work by bicycle. It is not because the bicycles are expensive or people feel___5____ if they ride to work. It’s because __6___ cars on the roads becomes larger. It certainly becomes ___7___ to ride a bicycle. As a result, more people put their bicycles away and go to work ___8___ their cars , and in this way, the situation is made more serious.___9___ the best way to make riding safer and more popular is to create paths (开设通道) only for bicycles, and to make ___10___ so difficult and expensive for drivers to take their cars into the city that they will go back to use their bicycles. 小题1: A．invent B．inventing C．invented D．to invent 小题2: A．before B．when C．since D．until 小题3: A．much B．quite a lot of C．very little D．many 小题4: A．world B．countries C．land D．earth 小题5: A．lucky B．glad C．sorry D．tired 小题6: A．the number of B．a number of C．this kind of D．all kinds of 小题7: A．safer B．more dangerous C．much dangerous D．safe 小题8: A．by B．in C．use D．drive 小题9: A．Hardly B．May be C．Perhaps D．Nearly 小题10: A．it B．them C．us D．that