他的心脏每分钟跳动约70次。

His heart ___beats about 70 times per minute.

考试前我的心脏跳得很快。

My heart was ___beating so fast before the exam.

当你运动时，你的心脏跳动更快以泵送更多血液。

When you exercise, your heart ___beats faster to pump more blood.