hi iam abbas frm india i came 2 canada in 2005 and stayed for 4 months then came back 2 india due severe illness of my mother .then again i went 2 canada in dec 2007 for only 2 months i stayed there then i had 2 come 2 india for same reason as above . now i need a sound guidance frm u all that when i want 2 go 2 canada that i wont be stoped at the airport.plz give advice for safe secure n hasslefree entry into canada as my pr card will expire at the end of this year.