Answer:
She saw the dust in the air, the clouds in the sky, mice running and the walls around her
Explanation:
Formal.
As far as I know, there is no such thing as either standard or practiced diction. Informal is the way you communicate with your friends, for instance, which is not how you would write a thesis paper, legal document, etc.
The correct answer is:
The old gentleman with unusual eyes kept the hobgoblin hidden in the basement.