Multiple choice

The cow feeds --------- grass.

  1. in

  2. upon

  3. of

  4. on
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When discussing what animals eat, the correct preposition is 'on'. We say 'cows feed on grass', 'birds feed on insects', or 'carnivores feed on meat'. 'Feed in' indicates location, 'feed upon' is overly formal, and 'feed of' is grammatically incorrect.

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