One of them is concentrating entirely on his head.

Gets distracted often is not entirely concentrating on the show.

He needed to concentrate entirely on what he was doing.

He kept his eyes closed, to concentrate entirely on her thought.

It was concentrating entirely on flying, and took no notice of her.

I want to concentrate entirely on this book, her biography.

Two years later, though, she decided to stop performing and to concentrate entirely on composition.

The story now concentrates entirely on the survivors in the first boat.

And I concentrated entirely on what was immediately before me.

Indeed, special clubs have been set up which concentrate entirely on mountain rescue.