尽管我们尽力寻求共识，但谈判最终还是陷入了僵局。

Despite our best ___endeavour to reach a consensus, the negotiations ultimately stalled.

首次成功登顶珠穆朗玛峰是人类历史上的巨大努力。

The first successful ascent of Mount Everest stands as a monumental ___endeavour in human history.

他为掌握小提琴所做的不懈努力，最终以一场精彩的独奏表演得到了回报。

His relentless ___endeavour to master the violin finally paid off with a stunning solo performance.