这次失败的经历让他变得谦逊了。

The experience of failure ___humbled him.

那次失败的经历让他谦卑下来，并认识到自己的不足。

That failure ___humbled him and made him aware of his shortcomings.

他通过公开承认错误来谦卑自省。

He ___humbled himself by publicly admitting his mistakes.