他使劲摇动手柄，试图发动那台老式拖拉机。

He kept ___cranking the handle to start the old tractor.

临近考试，我们得开始加大复习力度了。

With the exam approaching, we need to start ___cranking up our study efforts.

这家食品厂正在快速生产大量罐头以满足市场需求。

The food factory is ___cranking out large quantities of canned goods to meet market demand.