請教8老師幾個N400表中的問題

8老師:

填寫N400表格遇到幾個問題如下：

1. What is your USCIS Online Account Number?

印象中沒有見過這個number, 是否填寫 "I do not have an online account number".

2. Where have you worked and/or attended school (full time or part time) during the last 5 years?

一直在家沒上班是否應該填“unemployed"或者別的

3. Have you EVER been a member of, involved in, or in any way associated with any organization, association, fund, fundation, party, club, society, or similar group in the United States or in any other location in the world?

grocery membership應該不算吧（比如有costco membership)，是否填"no"

謝謝您！