I would use epoxy. If the holes are large I would coat wooden dowels with the epoxy and hammer them in, making sure that they do not protrude above the surface. Once the epoxy sets you can put another coat on the patch to seal it. You can also put a small peice of wax paper over the final coat to make it lie fair. \:\)
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"The best argument against democracy is a five-minute conversation with the average voter."
Winston Churchill

"So it goes." Kurt Vonnegut jr.