这种环保袋是用可回收材料制成的。

This eco-friendly bag is made from recycled ___materials.

这位作家花了三个月时间收集小说的素材。

The writer spent three months collecting ___material for his novel.

这块面料柔软舒适，适合做睡衣。

This ___material is soft and comfortable, perfect for pajamas.

这位证人的证词对案件至关重要。

The witness's testimony is ___material to the case.