我正在为正在写的一篇文章收集素材。

I'm collecting ___material for an article that I'm writing.

他们主要对搜集资料和数据感兴趣。

They are mainly interested in gathering ___material and data.

这位作者花了数年时间为他那本历史小说研究资料。

The author spent years researching the ___material for his historical novel.