Explicação com vídeo: https://www.youtube.com/watch?v=aT7FIjUCCdU
Link 1: http://www.ecenglish.com/learnenglish/lessons/in-on-at-prepositions-place
Link 2: https://www.ego4u.com/en/cram-up/grammar/prepositions/exercises?07
Exercício com áudio: http://www.mcedservices.com/Prepex/quiz3/Qz3-2Q01.htm