1 . To prevent the world from ________ (pollute) by cars, we will have to make some changes in the way many of us live. （所给词的适当形式填空）

2 . The film star wears sunglasses. Therefore, he can go shopping without being r________. (根据首字母单词拼写)

3 . 我们突然想到，我们可以设立一个野生动物保护区来保护动物们不被猎杀。
It ________ us that we could set up a ________ ________ to protect animals from being ________.

4 . After__________to drive out of town, I began to_________.（根据句意填空）