那栋建筑不安全，所以他们贴了一个牌子写着“危险 - 请勿进入”。

The building was unsafe so they put up a sign saying "Danger - ___Keep ___out."

请勿进入限制区域。

Please ___keep ___out of the restricted zone.

我们应该让猫远离卧室。

We should ___keep the cats ___out of the bedroom.