[b]请教有关美国签加拿大IMM 5257、IMM5645填表事宜[/b]

1，网上帖子都说没有的部分都填N/A但加拿大官网写NA，纠结到底填哪个？
2，第7个问题current country of residence：是填现在居住的国家对吗？那日期上究竟填签证的起止日还是从入境时算起？截止日填F1的截止日还是签证到期日？官网上写：The dates (From – To) you have been living in your country of residence. 但我还不是很明白
3，IMM5645表上问家里人是否一同前往加拿大，实际情况是家里人在中国办加拿大签证，我自己在美国单独办，那我到底填是还是不是？
4，IMM 5257-SCHEDULE 1是什么情况的人才需要填，还是只要申请就人人都需要填？
5，IMM5409是同居的人才填的是吗？结了婚的不需要填吧？
6，Previous Activity/Occupation
Provide details of your previous Activity/Occupation for the past 10 years. If you are retired, provide the 10 years prior to your retirement.
指的是十年前还是过去到现在的十年内？
下面是官网提示：
1)Complited Family Information(IMM 5645), if applicable
Note: Complete this form only if it is required by the responsible visa office for your region.（这个表我究竟要不要填？）
2)Complited Application for Temporary Resident Visa made Outside of Canada (IMM 5257 - Schedule 1), if applicable
3)Statutory Declaration of Common-law Union(IMM 5409),if applicable
4)Use of a Representative(IMM 5476),if applicable
网站链接http://www.cic.gc.ca/english/pdf/kits/forms/IMM5484E.PDF
感激不尽！