Have to? You don't have to use a single one, if you don't feel like it.
These domains aren't premium. You'd be lucky if you can sell them at registration fee.
Well, that doesn't really matter. Do you have permission to re-post these articles? If not - they are stolen. Period.
Your blog is full of stolen articles. There is NOTHING worthwhile about your website. Do yourself (and the rest of the Internet) a favour, and...
Separate names with a comma.