for the third one what do they mean by that....

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It means that the officer must be convinced that you and your husband will be able to support yourselves without relying on government assistance (welfare) when he becomes a permanent resident. If you are both employable (meaning past history of employment, skills, experience, language ability), educated and willing to work it will not be a problem. And you do not have to inform them that you are no longer employed. I'm assuming you will find another job relatively quickly.