Sentence:  In a sense almost all high school and college courses could be considered as vocational to the extent that later in life the student in his vocation ( which may be a profession ) will be called upon to <WSD>use</WSD> some of the skills developed and the competence obtained . 
Meaning of the word marked with <WSD> tags:  put into service; make work or employ for a particular purpose or for its inherent or natural purpose