At that time, the general public was/ were not aware of the health risks.

　　那時，公眾對各種危及健康的`因素尚不了解。

　　She was aware that she was losing all sense of perspective.

　　她意識到自己正在失掉一切正確判斷的能力。

　　I'm aware of Mark's reputation for being late.

　　我知道馬克遲到是出了名的。

　　Were you at any time aware of a quarrel between the two of them?

　　你什么時候注意到他倆拌過嘴嗎？

　　She slipped away without him being aware of it.

　　她悄悄離開，沒有讓他發(fā)覺。