Take another look at the sentence:

Stuart wiggled his foot, drummed a Jimi Hendrix riff with his pencil, and __________, but he could not burn off the caffeine-induced energy from an extra large cup of coffee.

The blank needs to begin with a simple past tense verb. You chose his jaw worked a mouthful of gum, which is a main clause and thus causes a parallelism error.

Before you continue, review the rules for parallel structure.

Go back to the sentence to try again.

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