Translation of "Alert" in Chinese

I'll alert Tom.

我会警告汤姆。

You're very alert.

你真是警惕。

You must be alert.

你得留意一下。

The tsunami alert was cancelled.

海啸的警报解除了。

A sparrow is very alert in its movements.

麻雀的动作很快。

A tsunami is coming, so please be on the alert.

海啸来了，密切注意啊。