Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to clean a gas fireplace [title] Turn the gas off. [step] Before you begin cleaning your gas fireplace, you must first make sure you turn the gas valve to the " off " position. If you leave the gas running, it could cause a dangerous gas leak in your house.

Ending1: [substeps] Turn off the gas valve to the gas heater or. Turn off gas water to the steam pipe if you use a gas stove, as rain can cause leaks near open valves. Ending2: [substeps] The gas valve is typically on the wall next to the fireplace. Allow a few minutes for all the gas to leave the piping in the fireplace. Ending3: On the other hand, if you leave the gas turned off for even a few minutes, you risk igniting the gas before you start cleaning. [title] Remove all chairs or benches from the gas fireplace. Ending4: [substeps] To turn the gas valve to the " off " position, simply turn the valve clockwise. Do not turn the gas faucet to the " off " position; you will have to turn it itself clockwise until the water begins to flow again.

Answer format: ending1/ending2/ending3/ending4