French language Q&A Forum

I was in the town hall in "Le Broc" yesterday, and the sign said "La mairie de Le Broc". Are you sure you've got this rule right? Following this train it would be "Elle va a Le Broc", not "Elle va au Broc". However I did notice that there were somes signs in the town saying e.g. "Carroserie xx du Broc", so it seems like there's some ambiguity here. I would assume the town hall would be correct?

Hi. I thought negative opinions were followed by the subjunctive  and translated the above sentence thus: Je ne pensais pas que ce soit si intéressant.  Is that incorrect?

Thanks

My dictionary gives 3 translations for cookie : biscuit, petite gâteau,  and gâteau.   I chose to use petit gâteau, which was marked incorrect.  Since I can't see the cookie and don't really understand if there is a difference, perhaps according to shape or size, could someone elaborate on the nuances?  I have gotten into trouble with this with my friend, who is a native French person, when I used biscuit for cookies that she prepared. Apparently,  there is some disfunction unknown to me.