Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to fill nail holes [title] Mix dry powder filler with water according to the putty manufacturer's instructions. [substeps] This form of putty should be mixed to a stiff consistency. [title] Pack each nail hole full of putty with a plastic dish scraper and add extra putty so you create a slight putty mound.

Ending1: [title] Shake the molding powders for about 10-15 seconds. [title] Push plugs of putty into the work area. Ending2: [substeps] As the putty dries, it shrinks. Adding extra putty allows for this shrinkage, making sure the nail hole has been completely filled. Ending3: [title] Shape your marks using a putty knife. [substeps] Ideally, you can file the marks on each pair of nails using 180-grit sandpaper before gluing them to the material. Ending4: [title] Make a layer on your chosen wood base. [step] Suitable base is listed below : [substeps] Line a portion of plywood (preferably with a thick board or stain-cloth) with the top, of the wood or plywood layer before placing the putty layer, blocking the hole.

Answer format: ending1/ending2/ending3/ending4