2. Open the brackets and write down the sentences using Present Perfect Passive.
(раскройье скобки и запишите предложения используя Present Perfect Passive)
6. This court material was carried out as if he (to find) guilty.
7. By the middle of the 19th century about 60 chemical elements (to discover).
8. The new exhibition (to visit) by many foreign tourists.
9. The witnesses (to ask) by the end of the day.​