Here is the item:
When Henry opened the vegetable crisper at the bottom of the refrigerator, the puddle of rotting lettuce that he discovered __________ up the kitchen for the rest of the day.

The blank requires the past tense of stink, an irregular verb. You chose stank, one of two correct forms. Nice work, grammar brain!

Verb Simple
Present
Simple
Past
Past
Participle
stink stink(s) stank or stunk stunk

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