Here is the sentence:

Tiffany __________ through all of Dr. Olefke's 8 a.m. astronomy lectures; like black holes, the low grades on her exams sucked up any hope of passing the class.

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

Verb Simple Present Simple Past Past Participle
sleep sleep(s) slept slept

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