他昨天未能参加足球训练。

He ___failed ___to turn up for football practice yesterday.

他未能提到我们不会为此工作获得报酬。

He ___failed ___to mention that we wouldn't be paid for the work.

你的广告也未能提到没有折扣的事实。

Your advertisement also ___failed ___to mention the fact that there were no discounts.