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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   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.
(     )1. A. invent
(     )2. A. before
(     )3. A. much
(     )4. A. world
(     )5. A. tired
(     )6. A. the number of
(     )7. A. safer
(     )8. A. by
(     )9. A. Hardly
(     )10.A. it

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