Exercise 1. Give the plural of the following nouns.
cap, task, port, pipe, lake; comb, pig, hand, song, tube, name, meal, glove, room;
day, letter, door, opera; country, city, duty, industry; life, leaf, shelf, loaf; potato,
Negro, photo, zero; dress, bus, wish, rose, fox, page.

ports и ещё опечатка в buses

caps, tasks, ports, pipes, lakes; combs, pigs, hands, songs, tubes, names, meals, gloves, rooms; days, letters, doors, operas; countries, cities, duties, industries; lives, leaves, shelves, loaves; potatoes, Negroes, photos, zeros; dresses, buses, wishes, roses, foxes, pages.