Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to keep baking flour fresh [title] Buy only as much flour as you think you'll need. [step] That way, you won't suffer from an oversupply with a potential for the flour to go stale or spoil. [title] Use suitable containers to maintain freshness.

Ending1: [step] Purchase clean plastic container that's large enough for the flour, and tray it in a suitable temperature. This way you won't have to aerate it, break the grains, and weigh it down. Ending2: [step] This means that the food will have to sit outside, under natural light, and not be easily disturbed by bacteria. The container should be spotless so that it doesn't collect any flour or other contaminants. Ending3: [step] Any jars, containers, bowls and measuring cups should be used to keep flour from clumping together and drying unevenly. Fridge or freezer containers should be used for nutritional purposes. Ending4: [step] Airtight containers will help you to keep flour in great condition for longer. Use tall airtight containers that can be safely stored in your pantry or kitchen cupboards.

Answer format: ending1/ending2/ending3/ending4