3. He is interested learning Romanian.​

.. .. in Romanian

● in

Explanation:

● He is interested in learning Romanian.

More information:

what is prepositions:

● A preposition is a word which is placed before a noun or pronoun to show the relation in which a person or think denoted by the noun stand to some think else as —

kinds of preposition:

(1) simple preposition — prepositions of one word are called simple prepositions as —

(2) compound preposition — prepositions format by adding a perfix to a noun, adjective or adverb are called compound prepositions as —

(3) participle preposition — some project participles are also used at prepositions as —

(4) phrases preposition — some phrases are also used as single prepositions as —

Examples:

Hope it's helps you !!

yes, it is ethos.

i hope this !

-maddie

c. a group of tribes that formed a confederacy