Questões de Concurso Público Prefeitura de Patos - PB 2018 para Professor de Educação Básica II - Língua Inglesa

The alternative, which contains the prepositions that best complete the sentences below, is: “Prepaid meters have been launched with the aim __________ improving water service; however, they might be a problem __________ those who cannot afford paying __________ water services.”