Переведите словосочетания, содержащие причастие II
a) a broken cup, an unanswered letter, an opened window, a closed door, a written exercise, a developed country , a mixed economy, a discussed problem, produced goods, satisfied needs, privately owned firms, a translated text, widely used irrigation
b) Knowledge acquired by the students, the questions put to the teacher, the subjects studied by the first-year students, economic system based on private ownership, specialists trained at our university, the house built in our street