我把头贴在他的胸口，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，我会嫁给你”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，数着自己心跳的节拍。

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