专题一一阅读下面材料，在空白处填入适当内容(不多于3个单词)或括号内单词的正确形式。《全国新课标卷题型》 (2014•新课标ⅰ) are you facing a situation that looks impossible to fix? in 1969, the pollution was terrible along the cuyahoga river near cleveland, ohio. it __1__(be) unimaginable that it could ever be cleaned up. the river was so polluted that it __2__(actual) caught fire and burned. now, years later, this river is one of
