Вопрос по английскому языку:

Нужно выбрать верную форму инфинитива
1. A new discovery must … by a patent.
a) be protected b) have been protected c) to be protected

2. You can't … every contract you come across, but for the most important ones - employment, living arrangements, even medical treatment, be sure to have an attorney review it before signing.
a) read b) be reading c) have read

3. The policeman asked me … specific, because interpreting unclear language could lead to a lawsuit.
a) be b) to be c) to have been

4. There will be attempts … fraudulent trading.
a) to be preventing b) to prevent c) to be prevented

5. …the same mistake twice was unforgivable.
a) To be made b) To make c) To have made

6. It occurred to me that he was trying … something.
a) to be concealing b) to conceal c) to have

7. No one would rather … this building without the permission of the police.
a) to leave b) leave c) to have left