I put my hand on the back of her neck, working the tight muscles, keeping my voice quiet.

His effort was focused on keeping his voice quiet; he could not control his words.

Keep distractions to a minimum and keep your voice quiet.

"There's where you're wrong," she argued, obviously fighting to keep her voice quiet.

"That's the bandage," Wendy said suddenly, keeping her voice quiet.

"Such as they are," Cowper said, still keeping his voice quiet.

With a visible effort at self-control, Riker kept his voice quiet.

Roarke stood where he was, a foot away, and kept his voice quiet.

She kept her voice quiet until the door swung closed behind him.