6.
阅读下面材料,在空白处填入适当的内容(不多于3个单词)或括号内单词的正确形式。
John:Iˈve been noticing recently quite a lot of black smoke coming out of the chimneys of that factory near our school. __61__ really pollutes the air here.
Mary:Yes. But I heard recently that the __62__(own) of the factory have promised to take measures to reduce their factoryˈs pollution.
John:I hope they will keep their promise.
Mary:I think they will. Iˈve been told that __63__ special machine is supposed to be fixed by the end of this year. Itˈs said that the machine can clean the dust out of the smoke__64__ it goes into the air.
John:Thatˈs good. Dust is really __65__(harm) to our lungs. I know that because my familylives near a steel factory with a chimney constantly __66__(pour) out black smoke.
Mary:Oh, you live near the steel factory? Is it true that we shouldnˈt eat the fish from the lake near the steel factory?
John:Yes, thatˈs true—the lake __67__(pollute) by waste from the steel factory.
Mary:Why donˈt they do anything to clean up the pollution?
John:They always promise, __68__ they never act. A bit of action is __69__ we need.
Mary:Youˈre quite __70__.