From wherever it left off and it won't be cancelled until it reaches a finale.
The only rule is that you aren't allowed to bring back shows that have already had legitimate endings (like you can pick Scrubs: Med School, but not Scrubs with the main cast)
I would probably bring back My Name is Earl just because I loved that show and I am really sad that it was cancelled on a cliffhanger. Even if it only got one more season, I'd love to see a finale come out of it.
I also have to give honorable mentions to Firefly, Reaper, Mission Hill and The Critic