他同意来，我相信他会遵守诺言。

He agreed to come and I'm sure he'll ___keep ___his ___word.

事实证明，被雇佣来组织活动的公司没有履行承诺。

It turned out that the company that had been hired to organize it did not ___keep ___their ___word.

你承诺过要帮忙，所以请信守诺言。

You promised to help, so please ___keep ___your ___word.