i forgot
oh!!!i actually forgot to answer your question!!! hahahah, silly me-!!!
Well, i did not ask any questions at all.. They give you lots of information during the first hour, plus all the information you probably collected by checking the web... i think that you should only ask if you really have a doubt... I remember there was this girl sitting on the front who kept on asking questions and answering them.... she didnt even pass the first stage... i guess that if they see that you are trying way to hard, they wont call you back... You can show them you are interested by telling them how much you would like to work for them.... at least it was what i did, i was honest and i told them it had always been my dream... but i did not "bombered" them with questions...
Good luck to you amigo argentino!!