whenever you try to add more accounts from same machine that google robot start asking random questions..
I think it is a preventive measures of Google just right after the hacking of some Chinese last Tuesday.
Yes this happens. I tried to sign up for a friend from my home and there was this sms activation thing and my country was not available for sms sending at that time. What I did was invited him to gmail from within my google mail and then he was able to sign up easily.
Yesterday, I created more than 5 accounts on gmail and it didn't ask for any code activation. May be you're making too much. Wait for some and try again. Think this could help you little bit.