1 - С
2 - E
3 - A
4 - B
5 - D
In case of a gas leak I would contact the emergency service of Mosgaz.
In case of a terrorist attack I would call the Federal Security Service.
In case of witnessing a crime I would contact the police.
In case of a fire I would call the Emergencies Service.
In case of a life-threatening situation I would call an ambulance.