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Most Americans would find it hard to think that what life ____________
would look like without a car. But, some have realized _______ ____
the serious question of the pollution caused by the car. ____ ________
The polluted air becomes harmful and dangerous to health. ___ ________
One way to getting rid of the polluted air is to build a ___ _________
car that doesn¡¯t cause pollution. That is how several of the ____ ______
large car factories have been tried to do. But to build _________
a clean car is more easier said than done. Progress in this _________
field has been slow.
Another way is to take place of the car engine by a ___________
steam one. Inventors are now working on steam cars as well as
electric cars. Many makers believe that it will spend __________
years to develop a practical model that pleased people.
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