Given the task definition and input, reply with output. In this task, you're given a four sentences of story written in natural language. Your job is to complete end part of the story by predicting appropriate last sentence which is coherent with the given sentences.

Sentence1: Mark opened the back door of the restaurant and walked outside. Sentence2: It was the time of the day to take out the trash. Sentence3: Halfway to the dumpster, he saw many birds, feeding on the trash. Sentence4: He had gone hungry before so he knew all things must eat.
He felt bad for the birds.