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 rive was so polluted that it ___2__(actual) caught fire and burned. Now year late, this rive is one of____3__most outstanding examples of environmental cleanup.

　　But the river wasn’t changed in a few days__4__ even a few months. It took years of work ___5___(reduce) industrial pollution and clean the water. Finally, that hard work paid off and now the water in the river is___6__ (clean) than ever.

　　Maybe you are facing an impossible situation. Maybe you have a habit __7__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___8___(amaze) stories of instant transformation, for most of us the___9___(change) are gradual and require a lot of effort and work, like cleaning up a polluted river. Just be___10___(patience).

　　【文章大意】曾经重度污染的河流再次清澈。当你感觉什么事情不可能实现是时候，继续努力，耐心些，你就会成功的！

　　1. was考查时态。事情发生在1969年，是一个过去的时间，故此处要用一般过去时态，也就是要用was。

　　2. actually考查词类转换。修饰动词caught的要用副词，故此处要用actually。

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