The boy quivered at the sound.
The sudden noise scattered the birds.
The sudden noise startled the old man.
She called down from upstairs to ask what the noise was about.
The cat was scared by an unfamiliar noise.
Susie sat up until midnight, when she heard a strange noise.
I heard an unusual sound.
I heard a strange sound in the dead of night.
On hearing the noise, my brother started to cry.
When did you hear the sound?