根据短文内容及首字母提示补全单词，使短文完整、通顺

energy, invent, draw, until, dangerous,

create, in, tired, because, country

The bicycle is one of the simplest but most useful inventions in the world. What is the most surprising is that it was not ____ earlier, although the great inventor Leonardo da Vinci had ____ pictures for bicycles and flying machines and some other things. Those things were not produced ____ long after he died.

A person riding a bicycle uses very little ____ to make the bicycle move, and there is no pollution at all when you are riding. Even so, in most developed ____ , most people don't go to work by bicycle. It is not ____ the bicycles are expensive or people feel ____ if they ride to work. It's because the number of cars on the roads becomes larger. It certainly becomes more ____ 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. Perhaps the best way to make riding safer and more popular is to ____ paths only for bicycles.