IV. Change these sentences using the passive voice. Translate them

1. All the scientists of the world accepted the theory. 2. The scientist has attributed

the change in the properties to the change of the surroundings. 3. We haven't known

the reason for the surd’s radiation, 4. The scientist had performed several experiments

to prove his theory. 5. They haven't recognized our work first. 6. We study the

problems first then solve them. 7. They don't require different kinds of material for

the experiments. 8. The scientists split the nucleus. 9. The rays are striking the

surface. 10.We were working out the new design of our laboratory at that time. 11.

That scientist has not convinced us of his ideas. 12. The wind had altered its direction

by then. 13. They were applying the results of the experiment to practice.