Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to put out a fire [title] Cut off the oxygen of microwave or oven fires. [step] If something flames up in the oven or the nuke machine, stay calm. Turn off the device, close the door, and watch it closely.

Ending1: You will know it works when it flashes or turns blue and green. This indicates that the fire has crossed the circuit. Ending2: Listening to the gurgling sound of air escaping can cause a smoke alarm to go off, and the room may become more smoky. [substeps] If you are concerned that an accidental explosion could spread a fire, pop on your radio or cover any windows carefully to keep smoke out. Ending3: If there is still gas inside, it may be acetylservative or acetylratio. The oxygen also goes into the freezer. Ending4: Closing it off and eliminating the heat source should make small fires die down quickly. Get your fire extinguisher and watch it closely.

Answer format: ending1/ending2/ending3/ending4