根据句意、汉语提示或英文释义写出这些单词的正确形式。

1. Last Wednesday, our teacher told us to write an _____ (文章) about Christmas.

2. —Would you like to be a _____ (社会的) worker when you grow up?

    —Yes, I'd like to help people solve their problems.

3. In the wetlands, birds can _____ (不费力地) catch some fish for food.

4. It's her first time to leave home alone for such a long time, so she _____ her parents very much.

5. Many people still don't know the importance of _____ (keep something or somebody safe from danger)

     wildlife.