text: Finally, students when they're during summer break, they're really focusing on personal goals and having some joyful time. By letting them to designed their own summer projects will assure that its completed and it will be less mental stress for them. However, teachers have to make sure that those summer projects will be teaching them the correct things.       Based on the four sources, car usage should be limited in some way. Smog in Paris and other cities have governments placing restrictions on when and where citizens are allowed to drive their vehicles. A German has a certain city that bans cars and other places, such as Bogota, Columbia, have "car free days". These give citizens of nearly every country a thought of why drive when i can walk. Some expert sociologists even believe we are out of our peak car buying years and into one that is less vehicle extemsive and more stress free and relaxed.