到处都保持了一分钟的沉默，以示尊重。

A minute of silence was held everywhere as ___a ___mark ___of respect.

成功完成自己设想的一项任务，是成功的标志。

To succeed in a task that one has envisioned is ___a ___mark ___of success.

她快速解决复杂问题的能力是天才的标志。

Her ability to solve complex problems quickly is ___a ___mark ___of genius.