Sentence:  All belong to the collection being given to Wilmington over a period of years by Mrs. Sloan , who has cherished such revelatory items ever since she first <WSD>studied</WSD> with Sloan at the Art Students League , New York , in the 1920 's . 
Meaning of the word marked with <WSD> tags:  be a student; follow a course of study; be enrolled at an institute of learning