Sentence:  At the end of work one <WSD>day</WSD> , the personnel man took the applicants one at a time , asked them to sit behind the receptionist 's desk and he then played the role of a number of people who might come to the receptionist with a number of queries and for a number of purposes . 
Meaning of the word marked with <WSD> tags:  the recurring hours when you are not sleeping (especially those when you are working)