Can i leave canada the day i complte the requirment of 1095 days in the four year period, and go to usa and coback when my interview and other stuff comes.
Do i need to provide mailing address of canada or states in the apllication kit.

not on the day... but theoretically, the day after... you become eligible for citizenship the day after you complete 1095 days... which is what you application should be dated on... the day after... so you you can apply the day after, and leave... make sure you are available after that though... as sometimes cic gives very short notice...