1.   Her heart began to pound frantically, as if she were having a panic attack.

2.   My heart began to flutter as I lowered the heavy pyx into my pouch.

3.   My heart began to race and my mind went blank.

4.   Her heart had begun to pound inside her chest like a captive animal.

5.   My heart began to palpitate when I was announced as the winner.

6.   His heart began a crazy rhythm, and an intense anxiety took hold of him.

7.   My stomach lurched and my heart began to pound.

8.   His wretched heart began to pump ominously again and he closed his eyes for one second, tried to breathe slowly, tried to control himself.

9.   Her heart began to beat a little quicker and she waited for him to go on.

10.   He said it lightly but as she followed him from the staff-room she was aware that her heart had begun to beat very fast.