根据所给汉语，完成英语句子。每空填一词。

1. 我们应该尽力节约用水。

    We should try _____  _____ water as much as we can.

2. 我认为森林不适合人类居住。

    I think the forest isn't _____  _____ people to live in.

3. 我以前从没有听说过这个故事。

    I have never _____ _____  this story before.

4. 我们反对在我们的家乡建化工厂。

    We are _____ _____ chemical factories in our hometown.

5. 解决这个问题对我来说很困难。

    It's difficult for me to _____ _____ this problem.