我经常看到骑自行车上班的人。

I often see cyclists ___riding to work.

他驾驶摩托车快速行驶。

He is ___riding his motorcycle at high speed.

他从小就学会了骑马。

He learned ___riding horses when he was a child.

随着新政策出台，当地经济正乘着快速发展的浪潮。

The local economy is ___riding the wave of rapid development with the new policy.