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。
Are you facing a situation that looks impossible to fix?
In 1969, the pollution was terrible along the Cuyahoga River near Cleveland, Ohio. It____(be) unimaginable that it could ever be cleaned up. The river was so polluted that it   ___(actual) caught fire and burned. Now, years later, this river is one of ___most outstanding examples of environmental cleanup.
But the river wasn’t changed in a few days ___even a few months. It took years of work   ____(reduce) the industrial pollution and clean the water. Finally, that hard work paid off and now the water in the river is___(clean) than ever.
Maybe you are facing an impossible situation. Maybe you have a habit___is driving your family crazy. Possibly you drink too much or don’t know how to control your credit card use. When you face such an impossible situation, don’t you want a quick fix and something to change immediately?
While there are ___ (amaze) stories of instant transformation, for most of us the___(change) are gradual and require a lot of effort and work, like cleaning up a polluted river. Just be____(patience).