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In the world today，there are about a billion cars traveling on the roads and each of these cars（1）
produces
produces
（produce） 0.12 metric tons of carbon dioxide per year.That means each year around 120，000，000 metric tons of carbon dioxide is released into the air.（2）
To stress
To stress
（stress） this problem，Car Free Day was created.It not only brings public attention to the problem of car（3）
pollution
pollution
（pollute） but also encourages people to give up driving on the day and find another form of transportation.
Car Free Day is a holiday that originated in France and it falls（4）
on
on
September 22.It is a day（5）
when
when
people leave behind their cars from 5：00 am to 7：30 pm and take other forms of transportation.It was largely a（6）
symbolic
symbolic
（symbol） act at first，but so far，it（7）
has spread
has spread
（spread） to 46 countries and over 2，100 cities in the world.
The best way to celebrate this holiday is by leaving your car parked in your driveway or your garage on this day.Instead of（8）
using
using
（use） your vehicle，think about riding（9）
a
a
bike，walking and taking public transportation on the day.Besides，you can also（10）
actively
actively
（active） encourage your friends and family to do the same.
