|
make develop until by tire because they draw large good go only invent for danger |
The bicycle is one of the simplest yet most useful inventions in the world. What is most surprising is that it was not ___51___ earlier, although the great inventor Leonardo da Vinci had ___52___ pictures for bicycles and also ___53___ flying machines and some other things. Those things were not produced ___54___ long after he died.
A person riding a bicycle uses very energy ___55___ the bicycle move, and there is no pollution at all when you are riding. Even so, in ___56___ countries, most people don’t travel to work ___57___ bicycle. It is not ___58___ the bicycles are expensive or people feel ___59___ if they ride to work. It’s because the number of cars on the roads becomes ___60___, it certainly becomes ___61___ to ride a bicycle. As a result, more people put ___62___ bikes away and go to work in their cars, and in this way, the situation is made more serious. Perhaps the ___63___ way to make riding safer and more popular is to create paths ___64___ for bicycles, and to make it so difficult and expensive for drivers to take their cars into the city that they ___65___ back to use their bicycles.