Final answer:
The most fitting word to complete the sentence is 'high-spirited.'
Explanation:
The word that most accurately completes the sentence 'A restive horse is _[blank]' is high-spirited. A restive horse is one that is restless, spirited, and difficult to control. In the context provided, with descriptions of a horse bursting free and displaying energy and high desire, 'high-spirited' fits best.
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