用所给词的适当形式填空。

    For many people, life is a lot (easy) today. Medicine and diet are improving, and people are getting (healthy) and living (long). But communication is changing (fast) of all. Today, with the Internet, people can communicate (easily) than ever before with friends all over the world.

    Not all the changes are (good) ones. More people drive cars instead of riding bikes, so they are not as (fit) as they were. Increasing traffic makes the roads (crowded) than ever, and it also makes pollution (bad). We must all work harder to reduce pollution.