Измените предложения из активного в пассивный номер 2, пожаааалуйста

1 The conferees forest in some parts of the mountains have been destroyed by the fire this year. 2 The Soviet system of training specialists has been inherited by Kazakhstan.3 A great contribution in development of Kazakhstan as an independent country has been made by scientists.4 Rare animals and plants, previously unknown to the people, have recently been discovered and described.