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The word "олени" in the first sentence is the subject, so it must be in the Nominative case.

Case: — Caring about whom? About deer (Object with preposition "об"). Они подкармливают оленей зимой. The word "олени" in the first sentence is

The exercise typically involves a text about deer in nature reserves, requiring students to identify noun cases and complete specific grammatical tasks. The word "олени" in the first sentence is

В заповедниках живут олени. Люди заботятся об оленях. Они подкармливают оленей зимой. Step-by-Step Solution Guide 1. Complete the Sentences The word "олени" in the first sentence is

Look for the preposition "об". In Russian, this almost always signals the Prepositional case when referring to the object of a thought or care.