Are you asking what a fireman is? cause if so it is someone who puts out fires at burning houses, barns.etc (anything on fire) hope that helps :)
Antecedent of a pronoun is a word that the pronoun refers to, or replaces. So, in this sentence, we are looking for the antecedent of the pronoun IT. The pronoun IT replaces the noun Chicago, which means that the word Chicago is the antecedent of the pronoun IT.
IT provides the best opportunity, meaning that Chicago does that.
Plurilingualism is a situation wherein a person who has competence in more than one language can switch between languages from one language to another and vice versa
I think this is a continue the passage thing so, sorry if I’m wrong “ there’s somebody walking behind us. I think we are being followed “