当你感到兴奋或害怕时，心跳会加快。

The heart ___rate increases when you feel excited or scared.

当你感到兴奋或害怕时，心率会加快。

The ___heart ___rate increases when you feel excited or scared.

停车场每小时收费5元。

The parking ___rate is $5 per hour.

你会如何评价这部电影的质量？

How would you ___rate the quality of this movie?

这个城市的人口增长速度非常快。

The ___rate of population growth in this city is very high.