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The bicycle is one of the simplest yet most useful inventions in the world. What is most surprising is that it was not ___56___ earlier, although the great inventor Leonardo da Vinci had ___57___ pictures for bicycles and also ___58___ flying machines and some other things. Those things were not produced ___59___ long after he died.
A person riding a bicycle uses very energy ___60___ the bicycle move, and there is no pollution at all when you are riding. Even so, in ___61___ countries, most people don’t travel to work ___62___ bicycle. It is not ___63___ the bicycles are expensive or people feel ___64___ if they ride to work. It’s because the number of cars on the roads becomes ___65___, it certainly becomes ___66___ to ride a bicycle. As a result, more people put ___67___ bikes away and go to work in their cars, and in this way, the situation is made more serious. Perhaps the ___68___ way to make riding safer and more popular is to create paths ___69___ for bicycles, and to make it so difficult and expensive for drivers to take their cars into the city that they ___70___ back to use their bicycles.