One who changes his residence in a new area should be acquainted ______ one’s neighbors.

Acquaint someone/yourself with something (phrasal verb): 
English Meaning - To make someone or yourself familiar with something. 
Bangla Meaning - পরিচিত হওয়া। 
Example Sentence - Take time to acquaint yourself with the rules.

Complete Sentence - One who changes his residence in a new area should be acquainted with one’s neighbors. 

Source: Cambridge Dictionary.