I have submitted my citizenship application recently. My residency calculation includes 39 days happened in December 2010 and January 2011 when I did my first landing. I left Canada at that time and came back in September 2012 stayed continuously. I don't have any proof for my residency during the very beginning 39 days except; I applied for PR in the airport, opened a bank account (without any interactions) and applied for SIN card. I am worried if CIC asked me to provide more evidences (which I don't have) of my residency during this very beginning period. So, what can I do then? .. Thanks