在冬天，5点天就全黑了。

In winter, it was already ___pitch-dark by 5.

我们出发时天已漆黑，很快就在蜿蜒的小径中迷了路。

It was ___pitch-dark when we set out, and we quickly got lost among the winding paths.

没有月亮和星星，日落之后森林变得一片漆黑。

With no moon or stars, the forest became absolutely ___pitch-dark after sunset.