Gambling is the key to your answer as I don't see any other alternative to earn bitcoins fast, and if you have a good strategy and if you know on which you are betting then you can surely make some money at the end of the day If I have to earn bitcoins fast then I would surely go for gambling.
gambling is not profitable, besides its risky to try one, luck is always a factor either you'll win or not.. perhaps trying other alternative earnings here in the site is good, but not fast..
I believe trading bitcoin does not require any luck and it is a fast way of making big profits. But you need some big investments to get started with bitcoin trading.
Yeah, trading, but you gotta start with a larger amount when you want to try it... but its worth it..and its not so tiring...