Change the sentences from active into passive. 1.the fire has destroyed the conferees forest in some parts of the mountains this year. 2.kazakhstan has inherited the soviet system of training specialists. 3.scientists have made a great contribution in development of kazakhstan as an independent country. 4.they have recently discovered and described rare animals and plants previously unknown to the people

1. In this year the conferees forest in some parts of the mountains have been destroyed by fire2. 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 been discovered and described by them recently.