He could hear the roar of the fire, but far off now.

And both men heard the roar at the same time.

Any moment I expected to hear the roar of water.

I heard a roar; it could mean one of two things.

He heard a roar, saw part of the far mountain wall give way.

Larry heard a roar from the trees to the left.

Behind us, we could hear the roar of an engine.

If people had heard the roar of guns, they hadn't reported them.

He heard the roar again and went in that direction.

We would hear a distant roar every time he did something.