While filling out the Online Citizenship Application and under Residence & Tax section, we have to mention all the addresses for the past 5 years excluding all the Trips that were made due to Vacation, home stay etc. While during 5 years period, if we don’t have any Canadian address for 3 months back home stay and we mention foreign address due to that, do we have to provide an explanation letter on why we didn’t had any Canadian address at that time?