Some American cities are banning drive-through windows at fast—food restaurants. There are two basic reasons for the bans: concern for the environment and the need    1    (fight) obesity.

In the US, most adults drive automobiles and almost 40% of the adults are overweight. That’s partly    2    people are worried about the environment and unhealthy diets. Supporters of the bans hope fewer drive-through windows    3    (reduce) litter and air pollution from customers driving cars. Some also think that people will choose healthier food if there is no longer the convenience of a drive-through window.