Theoretical is the opposite of Active. Active is related to Fit. Fit is similar to Acceptable. 
Instrument is related to Paper. you are likely to find Paper in/at/on Notebook. you are likely to find Notebook in/at/on Classroom. 
Theoretical <--Antonym--> Active <--RelatedTo--> Fit <--SimilarTo--> Acceptable 
Instrument <--RelatedTo--> Paper --AtLocation--> Notebook --AtLocation--> Classroom 