Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to cut heating bills this winter [title] Rearrange your furniture to assure all heating vents are clear. [step] Keep seating areas away from outside walls so you do not feel drafts while you relax. [title] Close all vents and doors in unused areas of your home.

Ending1: [step] Heat rises, you may want to close vents on the upper level if it is only used for sleeping. [title] Limit the use of kitchen and bathroom ventilation fans. Ending2: [step] Small gaps they may close into will cause electric shutoff damage. You can also close any windows and doors that leave unnecessary space for drafts. Ending3: [step] This will give yourself the luxury of staying as far away from all openings as possible. The cold, winter air will also block any drafts, which cannot be helped by heating vents. Ending4: [step] Heat meters, heat thermometers, heating vents, heating pads, and other heating equipment must be changed every 4 to 6 months. If you have any clutter on your furniture, unpack it, and put it in a temporary bundle so you will have plenty of space.

Answer format: ending1/ending2/ending3/ending4