She looked down at the links between them, concentrating on keeping her feet.
I was concentrating on keeping my leg still, but even at a walk, it hurt a lot.
That decision made, he concentrated on keeping any sign of it off his face.
For now he had to concentrate on keeping himself alive.
I've been trying to concentrate on keeping the ball down.
I didn't even try not to cry out any more, simply concentrated on keeping moving.
Eleanor, his wife, concentrated on keeping the children out of the way.
She concentrated on keeping him still, but he was too strong.
"I don't know but, right now, we have to concentrate on keeping some distance between us and them."
I had to concentrate on keeping a slow, even pace.