1. (2021高二下·武强期中) 阅读下面短文，在空白处填入1个适当的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 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 leave 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).