I spare no efforts to learn English.

我不遗余力地学英语。

Let's spare no efforts to carry out the plan.

让我们不遗余力地实现这个计划吧。

I'll spare no efforts to make my dream come true.

我会不予余力的努力实现我的梦想。

I'll spare no efforts to do a good job on my post.

我将在我的岗位不遗余力把工作做好。

We should spare no efforts to make up for lost time.

我们应当不遗余力把失去的时间补回来。