As we all know, the United States is full of cars. There are still many families without cars, some families have two or more. However, cars are used for more than （pleasant）. They are a necessary part of life.
Cars are also used for business. They are driven to offices and factories by workers have no other way to get to their jobs. When salesmen （send）to different parts of the city, they have to drive in order to carry their products. Farmers have to drive into the city in order to get （supply）.
Sometimes small children must be driven to school. In some cities, school buses are used only children live more than a mile away from the school. If the children are too young to walk too far, their mothers take turns （drive）them to school. One mother drives on Mondays taking her own children and the neighbors' as well. Another mother drives on Tuesdays, another on Wednesday, and so . This is called forming a car pool. Men also form car pools, with three or four men taking turns driving to place where they work.
In spite of this, more car pools should be formed in order to put fewer cars on the road and use （little）gas.