He must have been staring from the window for a full ten minutes, when a short rap sounded outside his door.

At last the shuffle of many feet sounded outside the heavy door.

A soft step sounded just outside the parlor door, and she closed her book at once.

It was well he did, for at that moment footsteps sounded outside the door.

He was writing another letter when footsteps sounded outside his door.

The trumpet sounded a third time, just outside the hall.

As if in answer to his statement, footsteps sounded outside the room.

Harry was just starting that task, when voices sounded outside the door.

In a moment, however, a quiet hum sounded outside the sphere.

A weird cry sounded from the road outside the house.