But she heard my footsteps on the gravel and glanced up.

"Come to think of it, I didn't even hear you on the gravel."

She must have heard his feet on the gravel because she swung around to face him.

And then he heard the sound of slow footsteps on the gravel.

Isobel had heard the wheels of his car on the gravel.

The door bell rang; and in any case the three of them had already heard the steps on the gravel.

I heard his steps on the gravel of the path behind me, but kept my back turned, and walked faster, almost running.

I heard a step on the gravel around the corner of the house.

A moment later he heard the crunch of her boots on the gravel.

Then I heard a car horn blow and the crunch of heavy steps on the gravel.