2us - It's short which is a good thing. What had you in mind for it? Perhaps use it to advertise flights to the US?
genetechnology - A nice sounding name but not that valuable commercially IMO. The problem with biotech is that it requires a load of investment to make the science work so they don't tend to pay much for a good domain name, their priorities are elsewhere.
b-startup - Sorry, I can't see value here.
searchvenues - I'm thinking a site where you can search for specific types of venues, e.g. conference venues, but the problem with this name is that it's not focused enough and therefore it would be difficult to make it work, and so the domain isn't that sought after IMO.
erotic-writing (generates a few dollars a week parked) - Of the domains here, this easily has the most commercial potential. If you can generate some content then it will be relatively easy to make some money here, Ann Summers affiliate programme, dating etc etc.
Rgds