Here is the item:
While Allison gripped the roof's edge, she no longer resented the many hours that her boyfriend Chris spent in the gym. After all, his strong arms would catch her when she loosened her grip and __________ to the ground below.

The blank requires the simple past of fall, an irregular verb. You chose fell, the correct form. Hallelujah!

Verb Simple
Present
Simple
Past
Past
Participle
fall fall(s) fell fallen

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