Помогите пожалуйста перевести с пассивного залога в активный, 1.This article is often referred to. 2 Lewis Carroll is remembered not as mathematician but as the author of Alice in Wonderland. 3. My paintings will be exhibited at the picture gallery. 4. The first spaceship was constructed by the Soviet scientists. 5. The anniversary of the liberation of Minsk is celebrated on July, 3. 6. A new system of work is being started by the librarians. 7. The doctor must be sent for at once. 8. This talk must have been started by our opponents. 9. The problem is being discussed now.