It will help them improve English. It will help them to improve English. Answering the call of *** enables Him to work within us those things that are pleasing to Him.
As to the third sentence of your answering post, let me, if I may, take out one irrelevant-at-the-moment phrase to simplify my line of questioning. Why is that only the first can prevail?
Answering the call of *** enables Him to work those things that are pleasing to Him.
Answering the call of *** enables Him to work on those things