作为家庭作业，我想让你写一篇关于濒危物种的文章。

For homework I want you to write an ___essay on endangered species.

我可以额外写一篇文章。

I could write an extra ___essay.

她为比赛提交了一篇关于气候变化的文章。

She submitted an ___essay about climate change for the competition.