小偷悄悄溜进房间时没有发出任何声音。

The thief ___crept into the room without making any noise.

随着时间推移，一种不安的情绪慢慢在团队中蔓延开来。

A sense of unease ___crept into the team over time.

小偷悄悄溜进了房间，没有发出任何声音。

The thief ___crept into the room without making a sound.