我听到身后有脚步声，迅速转过身。

I heard ___footsteps behind me and quickly turned around.

在拥挤的城市街道上，你能清楚地听到行人的脚步声。

On the crowded city street, you could clearly hear the ___footsteps of the pedestrians.

在寂静的走廊里，逐渐靠近的脚步声是唯一的声音。

In the hushed corridor, the approaching ___footsteps were the only sound.