小偷悄悄地在黑暗中爬行，试图不被发现。

The thief was ___creeping in the dark, trying not to be noticed.

一种不安的感觉正悄悄地蔓延到他的心里。

A feeling of unease was ___creeping into his heart.

雾气正慢慢爬上山坡。

The fog was ___creeping up the mountain slope.