Take another look at the sentence:

My grandmother doesn't trust banks, so she has __________ money all over the house. Once, I pulled an old Reader's Digest off a shelf and found seven $100 bills stuck between the pages.

The sentence requires the past participle of hide, an irregular verb. Hidden is the past participle.

Verb Simple Present Simple Past Past Participle
hide hide(s) hid hidden

Hiden, the form you chose, is a spelling error. Before you continue, review the rules for irregular verbs.

Go back to the sentence to try again.

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