Take another look at the sentence:
Diane always wonders where she will next discover a pair of her husband's dirty socks. Yesterday Mike __________ two in the refrigerator next to a carton of orange juice.
The sentence requires the past tense of leave, an irregular verb. Left is the simple past form.
|Verb||Simple Present||Simple Past||Past Participle|
Leaft, the form you chose, is a spelling error. Before you continue, review the rules for irregular verbs.