Changes these sentences into passive form 1.People should plant more trees to prevent floods and mudslides 2.Workers trimmed the trees on the streets when there was a warning about a severe typhoon 3.The government did not give the residents warnings on the tsunami on time.It killed millions of people and animals in the city 4.Many writers wrote biographies of Barack Obama,the 44th President of the United States 5.People fixed their houses' roofs before the tornado came 6 They have sent emergency workers to rescue people trapped in the collapsed buildings 7 These days,people can predict natural disasters more accurately thanks to the development ofclimatology 8 Mudslides buried many houses in Yen Bai province 9Volunteers delivered foods and purified water to the residents of flooded villages 10 They had the police arrest the shoplifter 11 How many games has the team played? 12 How can they open this safe?

1.More trees should be planted to prevent floods and mudslides.

2.The trees were trimmed on the streets by workers when there was a warning about a severe typhoon.

3.The residents warnings weren't given on the tsunami by the government on time.Millions of people and animals in the city were killed.

4.Biographies of Barack Obama,the 44th President of the United States were written by many writers.

5.Their houses' roofs were fixed before the tornado came.

6.Emergency workers have been sent to rescue people trapped in the collapsed buildings.

7.Natural disasters can be predicted more accurately these days,thanks to the development of climatology.

8.Many houses were buried in Yen Bai province by mudslides .

9.Foods and purified water were delivered to the residents of flooded villages by volunteers.

10.They had the shoplifter arrested by the police.

11.How many games has been played by the team?

12.How can this safe be opened?

1. More trees should be planted to prevent floodss and mudslides.

2. The trees were trimmed on the street by workers when there was a warning about a severe typhoon.

3. The residents' warnings weren't given on the tsunami by the government on time. Millions of people and animals in the city were killed.

4. Biographies of Barack Obama, the 44th President of the United States were written by many writers..

5.Their houses' roofs were fixed before the tornado came.

6. Emergency workers have been sent to rescue people trapped in collapsed buildings.

7. Natural disasters can be predicted more accurately these days, thanks to the development of climatology.

8. Many houses were buried in Yen Bai province by mudslides.

9. Foods and purified water were delivered to the residents of flooded villages by volunteers.

10.They had the shoplifter arrested by the police.

11. How many games have been played by the team ?

12. How can this safe be opened ?