Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to react to explosions in your vicinity [title] Exit the building asap. [title] Crawl low if there is smoke. [title] Use a wet cloth, if possible, to cover your nose and mouth.

Ending1: [step] Otherwise you don't have access to your extinguisher. If there is smoke, you may be able to evacuate on foot. Ending2: [title] Move slowly towards the center of the blast. [step] Once you see smoke coming from the blast area, evacuate as quickly and normally as possible. Ending3: [title] Call emergency services if there is gas remaining in the building. [step] If you can't wait for help, call for help yourself. Ending4: [title] Use the back of your hand to feel the upper, lower, and middle parts of closed doors. [title] If the door is not hot, brace yourself against it and open slowly.

Answer format: ending1/ending2/ending3/ending4