In this task, you're given the title of a five-sentence story and the first four sentences. Your job is to write the last sentence of the story such that it seamlessly connects with the rest of the story.

Title: A Lesson Learned. Sentence 1: Gabriel was asked never to leave the front door open. Sentence 2: One day Gabrielle was in a hurry and forgot to close the door. Sentence 3: Gabriel's dog, Snoopy, saw that the door was open and ran out of it! Sentence 4: After an hour Gabriel finally found Snoopy in the neighbor's yard.
Gabriel learned his lesson and never forgot to close the door again.