Переделайте из активного залога в пассивный he gave me the key to his room did you find the missing documents ? nobody took any notice of the body

I was given the keys to his room./The kes to his room were given me.
Were the missing documents found by you?
Was the body taken any notice from somebody?

Задача 6. Выберите правильные времена (Present Perfect, Simple Past или Past Perfect или непрерывное, Настоящее простое 12. Кто (читал) мои деловые бумаги? Меня действительно раздражает, когда кто-то делает такие вещи.13. Когда Павел (сойдет) с поезда, он (бросит) свой (пристегнет) билет на железнодорожную линию.14. не успеет Фил (пристегнуть) ремень безопасности, как самолет (взлетит). 15. мой сосед (играет) в теннис в течение трех лет, а затем он (бросает) его.16. Дэйв(учит) испанский в течение последних двух лет, а теперь он (учит) английский тоже.Неудивительно, что Сара устала. Она у меня (играет) много в бридж.18 Это был второй раз, когда я смотрю фильм "Безумие короля Георга". 19. машина Кевина (издает) очень странный шум с тех пор, как у нее (кончился) бензин.20. Линда (всегда предпочитает) собак кошкам.
Это перевод ( если что )

The system of education in the USA varies greatly from state to state. School education in so called state public schools is free. Parents are free to choose any public school for their children. Although there are a lot of private schools, mainly religious, and parents have to pay for them. A school year starts in September and ends in June. It is divided into three terms or four quarters. 

American children start attending elementary schools at the age of 6. They continue their studies for eight years there (8 grades). Their basic subjects in the curriculum at this stage are English, Arithmetic, Natural Science, History, Geography, Foreign Language and some others. After that pupils may enter a Senior high school or if they go to a 5- or 6-year elementary school, they then attend a 3- or 4-year Junior high school, and then enter a Senior high school. Pupils graduate from high schools at the age of 18. The high schools (also known as secondary schools) are generally larger and accommodate teenagers from four or five elementary schools. During the school year the students study four or five selective subjects according to their professional interests. They must complete a certain number of courses to receive a high school diploma or a certificate of school graduation.