Definition: When your heart beats, it makes regular movements and sounds. Level: B1
医生到达时，他的心脏已经停止了跳动。
By the time the doctor had arrived, his heart had stopped ___beating.
我的心像铃铛一样跳动，我非常兴奋。
My heart was ___beating like a bell and I was really excited.
当我紧张时，我的心跳得很快。
When I'm nervous, my heart ___beats quickly.
