我把头靠在他胸前，但感觉不到心跳。

I put my head on his chest but I could feel no heart ___beat.

当她说“是的，我愿意嫁给你”时，我的心跳漏了一拍。

My heart missed a ___beat when she said, "Yes, I'll marry you."

过了一会儿，她开始呼气，数着自己心跳的次数。

She started to exhale after a moment, counting the ___beats of her heart.