In one of the GRE questions, I encountered with the beneath inquiry:
A book is your golden ticket into the speaking business. If you had a book published by a "real" publisher within the last 12 months in your hands, you have the calling card you need to get those speaking engagements now. Some authors-to-be and new authors have trouble figuring out precisely how to ___________ that book into speaking.
I mused that the right answer is A or C, but I found that neither is correct. And B is the accurate item. It seems that the blank space should be filled with the synonyms of use, exercise, etc. and to me, "leverage" is out of the question.