Take another look at the sentence:

When Mom __________ out the kitchen rug, dog hair, bread crumbs, coffee grounds, and spaghetti noodles flew through the air and dusted the sidewalk.

The sentence requires the past tense of shake, an irregular verb. Shook is the simple past form.

Verb Simple Present Simple Past Past Participle
shake shake(s) shook shaken

Had shook, your choice, is wrong because you cannot combine shook, the simple past form, with an auxiliary verb like had. Before you continue, review the rules for irregular verbs.

Go back to the sentence to try again.

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