Some sentences contain more than one error, and a few sentences are correct.
Today, we wrote letters, cleaned the house, and were returning phone calls. When one is driving, you should keep your eyes on the road, thats the best way to prevent accidents. I would rather be riding my bicycle than drive a car. People should be concerned about one's dependence on technology, and strive to be more self-sufficient. Every time I see one of those fancy, jazzed-up convertibles on the street.