Change the following sentence into passive voice - unleaded petrol controls pollution

Pollution is controlled by unleaded petrol.

Explanation: A car's catalytic converter removes the pollutants from the fuel as it is burnt. ... Vehicles not fitted with catalytic converters do not process the aromatic additives in unleaded fuel.

1.the hosts on two opposing mountains stood,  

2.thick as the foliage of the waving wood;  

3.between them an extensive valley lay,  

4.o'er which the gleaming armour pour'd the day,  

5.when from the camp of the philistine foes,

6. dreadful to view, a mighty warrior rose; in the dire deeds of bleeding battle skill'd,

the answer is:

in the fourth paragraph. ( the paragraph that begins with “on friday of my third ”).

hope it !