Review the item:
The last slice of cheesecake __________ on a platter in the middle of the table; everyone wanted to eat it, but only Cassandra was assertive enough to slide the slice onto her own plate.

The slice of cheesecake rested on the platter. Thus, you need a form of lie. Since the sentence is past tense, you need the simple past form.

Consult the table below or review the rules.

Infinitive Definition Simple
Present
Simple
Past
Past
Participle
Present
Participle
to lay to put something down lay(s) laid laid laying
to lie to rest or recline lie(s) lay lain lying

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