Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to secretly open a sealed envelope [title] Place a tea kettle on the stove. [step] Boil water in a tea kettle until steam begins to shoot through the spout. The steam is what you'll use to loosen the glue in the envelope you want to open.

Ending1: [substeps] Turn on the kettle and place tea kettle on the stove at it's highest so that the bottom of the kettle is above the boiling water. Slowly lower the food into the boiling water. Ending2: [title] Pick up a tea bag and set it over a smaller opening. [step] Place the bag of tea bags over the larger opening in the envelope. Ending3: Keep in mind that the steam method can get a little messy and potentially warp the paper, so if it's imperative that the envelope looks fresh and new, you might want to just use a new envelope instead. [substeps] If the steam is coming out in a strong, steady stream, stick a spoon in the spout to diffuse it. Ending4: Use hot water to unseal the envelope. [title] Moisten the envelope's surface with cold water.

Answer format: ending1/ending2/ending3/ending4