When you came home after the gym, you smelt the leaking of the cylinder gas. You
1
will switch on the light and then see where it is leaking from.
2
open the window, turn on the flashlight of your phone to see where it is leaking from.
3
will switch on the light, open the window, and then will see where it is leaking from.
4
open the window, turn on the flashlight of your phone, and turn off the regulator of the cylinder.