The brave firefighter rescued him out of the time.

—>...............he was rescued out of the time by the brave firefighter...................................

 The earthquake has destroyed a big number of buildings in the city.

—> ..................a big number of buildings in the city has been destroyed by the earthquake..............................

 Why didn't they send an ambulance to us?

—> .........why weren't us sent an ambulance........................................

 People donated a lot of clothes, food and drinks to support the victims of the flood.

—> ........a lot of clothes, food and drinks were donated to support the victims of the flood...........................................

 Someone took him to the hospital for an immediate surgery.

—> ............he was taken to the hospital for an immediate surgery.............