So His heart beat high when he heard the door open.

He felt his heart beat many times before there was any sound.

For a long moment when her heart didn't beat, there was no response from him, and she allowed herself to hope.

His heart didn't always beat, but it could still break.

She did not know why her heart was beating so hard.

My heart beat too fast, and there did not seem to be enough air in the cold, dark room.

Lee, do you ask what makes your heart beat all night?

His heart still beat a little too quickly, but he didn't notice.

His heart beat like a wild thing as she came toward him.

His heart was beating so hard he might just as well have been running.

There was so little space left between them she feared he would feel her heart beating.

Her face pressed close to him and she could hear his heart beating.

He must be able to hear my heart beating, I think.

It will always need human engineers to keep its heart beating.

For a moment she felt his heart beating, then snatched her hand away.

"I can't hear anything for the sound of my own heart beating."

She heard the muffled sound of her own heart beating.

"Well, I've never sat real quiet in the dark next to the boundary, just to find out if they could hear my heart beating."

It was quiet; I could hear his heart beating, over and under the wind in the trees.

It seemed to me I could hear his heart beating.