16. The so-called language broadcasts, which ... for many years, by the state broadcaster in June 2004 as a part of reforms intended to meet EU criteria on minorities.

Решение:

Первый пропуск: 'had been banned' (действие произошло до другого действия в прошлом - были запрещены много лет назад). Второй пропуск: 'were introduced' (пассивный залог, были введены).

Ответ: had been banned / were introduced.