农民们把贫瘠的田地变成了肥沃的土地。

The farmers transformed the barren field into ___productive land.

萨拉是一位非常高效的员工，经常提前完成任务。

Sarah is a very ___productive worker, often completing her tasks ahead of schedule.

良好的睡眠有助于我拥有更高效的一天。

A good night's sleep helps me have a more ___productive day.