Business Interview

Hello everybody everyone! I'd like to know how formal I need to be when I will be in an interview. Can I use contractions, like "wanna" and "gotta?" I've heard about some of the usual questions which I will have need to answer. Please correct me if I did made any mistakes. Cheers!

Leandro, I would stay away from contractions such as 'wanna' and 'gotta' because they are examples of broken english that is more common among children than adults. However contractions such as "can't, don't, it's" for example are perfectly acceptable. Hope that helps.