BLANK, we need a verb 'determines'According to grammar, when the subject of the sentence is singular we need a singular verb for it.The subject in the given sentence is 'Career' which is singular in number so the correct verb for this is 'determines'The meaning of the word 'determine' is 'cause to occur in a particular way'So the correct sentence is- Career determines the KIND of LIFESTYLE ONE will LEAD and his/her position in the society.