这项发明对道路安全做出了重大贡献。

This invention made a major ___contribution to road safety.

她在今天的会议上没做出什么贡献，是吗？

She didn't make much of a ___contribution at today's meeting, did she?

所有贡献，无论多小，都将非常感激。

All ___contributions, no matter how small, will be much appreciated.