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: I did dishes last night and came across a really dirty pan. Sentence2: I let it soak in the sink while I cleaned everything else. Sentence3: By the time all else was done, the pan was still very dirty. Sentence4: I had to scrape away at it with steel wool.
By the time I went through two wool pads it was clean.