Audinorth.com is a trademark violation--grace delete.
Congo.us is geographically confusing as it binds the nation of the Congo with an American extension. This only makes sense if there is a Congolese-American association looking for a domain. In other words--grace delete.
Stooled.com has potential for a custom stool-maker, although it brings to mind all matters of the colon--which in itself may present another opportunity. You could try to outbound this or list at auction (keep your expectations low).
Long-term.net is hyphenated, which very rarely sells unless matched with wicked keywords. The .net extension is lower on the totem pole than .org these days. I'd say you'll be sitting on this for a while and you might as well just move on to better opportunities.
I know, it sucks, but you cannot reg on impulse...do your research and remember--80% of the domains out there are absolute junk.
Learn about keywords, branding, extensions, and trademark issues on Namepros. You need a very refined taste to make it in this game.