Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to operate an oxy gasoline cutting torch system [title] Fill in the gasoline tank with ordinary gasoline. [title] Select a torch and cutting nozzle according to your cutting task. [title] Fasten the nozzle with a pair of wrenches.

Ending1: [title] Immediately remove the torch from the tank and position it so the back of the leak nozzle must be facing the metal pipe. [title] Test the gas and wait for it to drain out of the tank. Ending2: [title] Power-up your farming tractor or any tractor using a special battery powered configuration. [title] Shut off your fuel tank by turning off the power valve on your tractor. Ending3: [title] Insert the cutting tool into the cut opening where the gasoline boils. [step] Try to angle the nozzle slightly to find the gas. Ending4: [title] Connect the fuel hose (gasoline hose) properly with a pair of wrenches. [title] Connect the oxygen hose properly with a pair of wrenches.

Answer format: ending1/ending2/ending3/ending4