доказать sin(x-y)sin(x+y)=cos^2y-cos^x

Change the following sentences into the Active Voice
1. A great deal of property is destroyed by tornadoes every year. 2. A lot of buildings were ruined by the hurricane. 3.Several few proposals were being considered by the MPs.
4.Some new equipment has been ordered by the company.
5. These papers should be signed by the company.
6. The Prime Minister should have been called this morning 7.The works of art have been examined by the experts.
8. The papers will have been received by John by tomorrow.
9. Tina Turner is being interviewed on TV now.
10. Ms Greta will be called (by somebody) tonight.

Помогите !!(

раставьте запятые пожалуйста!!
В усадьбе пруд тоже замерз,но речка у мельницы отяжелевшая и темная все еще сочилась в своих пушистых берегах и шумела на шлюзах.
Таким образом,Петр ставший уже юношей вырос,как тепличный цветок, огражденный от резких сторонних влияних далекой жизни. 

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