Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to survive a blizzard [title] Have a heat source ready. [step] If your home has a fireplace, make sure you know how to use it safely. When a winter storm warning is issued, bring enough firewood inside to last for a few days.

Ending1: [title] Check ahead of time for sheltered areas of your home. [step] If you're indoors, be sure to have doors covered or shielded, just in case the water evaporates at any time. Ending2: [substeps] This will be a costly investment if it's not a severe blizzard. It will also be covered with snow and ice, making it risky to build a campfire indoors. Ending3: [substeps] If you have a generator, be sure to have enough fuel to keep it running for a few days. Keep the generator completely outdoors, not in a garage. Ending4: This will be enough heat so that you can survive a winter storm like this. To make sure that you can retreat while the storm approaches, make sure your heat source is lit up to allow for an easy exit.

Answer format: ending1/ending2/ending3/ending4