题目内容：

  Life today has brought about new problem. One of the biggest problems of every nation is pollution. In America, there are laws ___66_____the air and water clean. These are new laws and it has taken much time __67____ a polluted river or lake. Now the fish are healthy again and people can enjoy __68_____in the clean water. 

  When food is brought from the store to the home, it is packed in paper, glass, or plastic. Every day a newspaper comes to the home. Americans use __69_____all these materials in the garbage which was picked up by a large truck. The truck these materials to a garbage dump or a land-fill. The truck dumped the garbage into a large hole and then earth was pushed over the garbage until the hole was filled. Then, a new hole must be found.

  As the years went by, the garbage increased as the population __70_______. Scientists suggested using some garbage again. They advised businessmen _____71____money by recycling or using paper, glass, and plastic again.

  Now, a recycling truck comes to each home once a week __72_______ up materials. American families are told _____73_____their newspaper in boxes and clean all glass, and plastic. The truck takes them to factories for recycling.

  Recycling is a way _____74_____the environment from pollution by __75_____ many materials again.