Chuyển các câu sau về dạng bị động

Someone saw the unidentified flying object last night
---->_________
You are supposed to send your application form to the university early
---->__________
They found their room being disorded arrangement
---->__________
The war destroyed all the ancient constructions
---->_________
The goverment will rebuild the Memorial Monument
---->_________
The students may elect Bella their leader
---->_________
Thu's younger sister dropped her plate of food onto the floor
----->_________