阅读下面材料，在空白处填入适当的内容(1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 ____ (be) imaginable that it could be ever be cleaned up. The river was so polluted that it ____ (actual) caught fire and burned. Now year 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) 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 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)