【正文】
dancing。 dance。 dancing。 terrible B. well。 bad D. better。 into B. pour。 into D. put。 Many years ago, people lived a hard life. They couldn’t use modern machines, because there was 1 one at that time. Today people have a better life but there are new problems. One of biggest problems is it has 2 our rivers and lakes dirty. It kills our fish and affects our 3 water. We call it water pollution. Noise pollution makes us talk more 4 and bee angry 5 . Air pollution is the most serious kind of pollution. It affects all living things in the world. Machines and factories 6 our air every day. Som