Re-enter Canada

[kye]

I changed my status in Canada from student to worker.I didn't finish my studies,just got lmo offer,applied for work permit and got it.I changed my visa status from student to W-1 worker as well.Im going to visit home outside Canada for 1 month and i was wondering that when i will return is there a possibility that the officer will ask me why i didn't finish my studies or something related to my previous status in Canada? Have to mention i'm on an un-skilled position,all my papers are ok,i will have a letter from my boss as well,but i worry that the officer may give me questions about my previous student visa,and study permit that i didn;t finish.It may sound that i worry a lot but i just want to be sure that i have no problems re-entering in Canada.Thank you!
p.s: Also if the officer will ask me what i will do after my 2 year contract will expire,is it ok to say that i will extend my work permit? or they expect you to say that you will return home?