There is no such thing as earning 1 btc in a short span of time.  Just like having a job you need to work for like two weeks to be paid.  You could start earning by doing some captcha typing, then invest some of your btc to legit investment sites.   Do not try to gamble.  Yes, seems a nice idea to grow your bitcoin fast but you need to have all the luck to win.   Just keep on working to earn bitcoins.  Nice feeling indeed if all your hard work will be paid of.