精选优质文档-倾情为你奉上1. 阅读下面的材料，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。 Are you facing a situation that looks impossible to fix？ In 1969, the pollution is terrible along the Cuyahoga River near Cleveland, Ohio. It (61)_(be)unimaginable that it could be ever be cleaned up. The river was so polluted that it (62)_(actual) caught fire and burned. Now years later, this river is one of (63) _most outstanding examples of environmental cleanup. But the river wasnt changed in a few da
