A light rap on the wood brought an immediate reply.

A second later there was a light rap on her door.

A light rap on the door frame broke her concentration.

There was a light rap on the front door, the door opened, and Joe walked in.

Got a light rap on the knuckles, and that's the lot.

Then all at once there was a light rap at the door and he seemed suddenly impatient.

Monk was about to thank him when there was a light rap on the door.

There was a light rap on the door, and they both ignored it.

There was a light rap on the door, which startled Devon awake.

Moments later I heard my mother's footsteps, followed by a light rap on the door.