Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to light a bunsen burner [title] Use a bunsen burner in a clean, uncluttered area. [step] Put away notebooks, papers, and any other clutter that might pose a fire hazard. Avoid using a bunsen burner below a shelf or other overhead equipment.

Ending1: Leaving it unattended will only cause a fire to blow out. [title] Leave the center of the burner out of direct heat. Ending2: [title] Wear safety gear and tie back loose hair or clothing. [step] In addition to wearing protective goggles and gloves, make sure your wardrobe is free of potential fire hazards. Ending3: Fire will naturally ignite, so unless you or someone in your household knows how to properly light a bunsen burner, only the top surface is lit. [title] Avoid using ovens or kitchen stoves. Ending4: Pull up a lid or door to conceal it with a covered pan. [substeps] If you already have small furnaces available to keep gas prepared, use other roomers to keep a fire at bay.

Answer format: ending1/ending2/ending3/ending4