他每个月都会为社区项目贡献一些时间。

He ___contributes some time to the community project every month.

健康的饮食和规律的运动有助于改善整体健康状况。

A healthy diet and regular exercise can ___contribute to better overall health.

她每月为这本科学杂志撰写专栏文章。

She ___contributes a monthly column to this science magazine.