prepositions,you should take proper care _ your books.​

you should take proper care of your books.

Answer:

‘You should take proper care of your books’.

Explanation:

A preposition is a function word that is usually linked to the pronouns, nouns and other content words. Prepositions are mainly used in phrasal verbs. Prepositions add more information to any noun or verb and signify various relationships such as time, position, location.

Examples: with, about, of, for, since, from to name some. Here of signifies a sense of possession and has been used hence to denote belongingness of the books by the listener.