农民们用拖拉机在田里犁地，为春播做准备。

The farmers use tractors to ___plow the fields in preparation for spring planting.

拖拉机艰难地在厚厚的积雪中开辟出一条道路。

The tractor ___plows through the deep snow to clear a path.

他埋头苦干，坚持完成了整个项目。

He ___plows through the entire project with determination.