Английский!!!! помогите перевести с пассивного залога в активный

Question

17.The cracks in the wall were caused by the earthquake. 
18.Thousands of rare birds are killed by hunters every year. 
19.Her purse was stolen on the bus. 
20.When will we be told the time of his arrival? 
21.An ancient village has been uncovered by archaeologists. 
22.Why hasn't the dishwasher been repaired yet? 
23.A new drug is being developed by scientists. 
24.A new breed of cow is to be introduced into the country by farmers. 
25.The furniture will have been removed by noon. 
26.Who were you going to be replaced by? 
27.The island is being ruined by tourists. 
28.Two rooms had been booked for her by her travel agent. 
29.She was seen to leave the building. 
30.Seats should have been reserved a week ago.

Ольга · Accepted Answer

17. The cracks in the wall were caused by the earthquake. caused 
18. Thousands of rare birds are killed by hunters every year.kill 
19. Her purse was stolen on the bus.stole 
20. When will we be told the time of his arrival?will 
21. An ancient village has been uncovered by archaeologists.has uncovered 
22. Why hasn't the dishwasher been repaired yet?hasn't repaired 
23. A new drug is being developed by scientists.is developing 
24. A new breed of cow is to be introduced into the country by farmers.introduces 
25. The furniture will have been removed by noon.will have removed 
26. Who were you going to be replaced by?replaced 
27. The island is being ruined by tourists.is ruining 
28. Two rooms had been booked for her by her travel agent.had booked 
29. She was seen to leave the building.saw 
30. Seats should have been reserved a week ago. should have reserved