Review the item:
Pumpkin, my oldest cat, loves __________ on my pillow. All night long, she and my head fight for room.

Pumpkin loves to rest on the pillow. Thus, you need a form of lie. The sentence requires an infinitive.

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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