Fiona doesn't know how to spell the plural of these world. Can you help her?
1) a video - 2) a zoo - 3) a tooth - 4) a deer - 5) a potato - 6) a fish - 7) a woman - 8) a mouse - 9) a roof - 10) a hero - 11) a dodo - 12) a leaf - 13) a sky - 14) a comedy -