Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to clean cork floors [title] Sweep regularly. [step] Use a soft-bristled broom, a dust mop, or a vacuum cleaner with a soft brush attachment. Depending on how heavily you use the area, repeat 2-7 times a week, or whenever you notice it getting dusty.

Ending1: For example, if you have areas in which your floor may be recently dirty, sweep weekly. [substeps] Cleaning floors routinely is another indicator of your attic being dusty. Ending2: If you wait too long, grit and dirt may gouge and scratch your cork floor. [substeps] Never vacuum without a soft brush attachment, as this can scratch the floor permanently. Ending3: [substeps] Although it may be tempting to scoop the dirt off a basement floor, do so only for tough floors-dust regularly would cause mildew and mold to grow. [title] Provide an air purifier. Ending4: Sweep hardwood floors over a variety of dusting levels throughout the season. [substeps] Some people contend that sweeping your floor is best for floors past their prime, following a traditional process that involves some vigorous sweeping.

Answer format: ending1/ending2/ending3/ending4