поставьте во мн.ч слова:
a video, a zoo, a tooth,
a deer,a potato,a fish,
a woman,a mouse, a roof,
a hero,a dodo,a leaf,a ski,a comedy

a video - videos, a zoo - zoos, a tooth - teeth, a deer - deer, a potato - potatoes, a fish - fish, a woman - women, a mouse - mice, a roof - roofs, a hero - heroes, a dodo - dodo(e)s, a leaf - leaves, a ski - skis, a comedy - comedies