天黑了离开房子不安全。

It isn't safe to leave the house ___after ___dark.

我想在天黑前回家。

I want to be home ___before ___dark.

昨天，天刚黑，我就在厨房里做晚餐。

Yesterday, soon ___after ___dark, I was in the kitchen and I was making my dinner.