He worked feverishly, barely ever looking up as his pencil flew up and down the pages of his notebook, and within an hour had solved every problem in every branch of higher mathematics that had ever puzzled either him or any of the great mathematicians of the land.
Based on context clues, what is the meaning of the word feverishly?
This is the answer because he wasn't moving slow if he did those math questions quickly, and he wouldn't work gloomily if he worked fast either. Methodically makes a bit of sense, but overall exitedly is the best answer.
