未能按时提交报告会延误整个项目。

___Failure ___to ___submit the report on time will delay the entire project.

他未能参加那次重要会议，这让他的经理很不高兴。

His ___failure ___to ___attend the important meeting upset his manager.

医生未能给出清晰的解释，这让病人感到担忧。

The doctor's ___failure ___to ___provide a clear explanation worried the patient.