他们开发新软件的雄心勃勃的项目以失败告终。

Their ambitious project to develop a new software ended in ___failure.

他的生意倒闭后，他觉得自己是个失败者。

He felt like a ___failure after his business closed down.

她未能获得晋升，这是一个巨大的失望。

Her ___failure to get the promotion was a major disappointment.