Random Riddle

You don't know because Lola is at her friend's house!
Hold your mouse over for the answer.
Lola goes to her friend’s house to study for a quiz. While they’re studying, they get hungry so they go to the refrigerator to see what they could eat. Inside, they find two apples, an ounce of cheese, a gallon of milk, and a pizza. They eat the apples, cheese, and pizza and drink the milk. What’s left in Lola’s refrigerator?