The bicycle is one of the simplest yet most useful inventions in the world. What is most surprising is that it was not _____ 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______ long after he died.
A person riding a bicycle uses ______ energy to make the bicycle move, and there is no pollution at all when you are riding. Even so, in developed _______, most people don’t travel to work by bicycle. It is not because the bicycles are expensive or people feel_______ if they ride to work. It’s because _____ cars on the roads becomes larger. It certainly becomes ______ to ride a bicycle. As a result, more people put their bicycles away and go to work ______ their cars , and in this way, the situation is made more serious._____ the best way to make riding safer and more popular is to create paths (开设通道) only for bicycles, and to make ______ so difficult and expensive for drivers to take their cars into the city that they will go back to use their bicycles.
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