Напишите следующие существительные во мн. ч.: a) place, library, language, dress, fly, watch, clock, country, eye, bus, bush, party, ray, thief, company, negro, mass, leaf, wolf, glass, key, box, half, life, day, play, factory, city, opportunity, colony, roof, month, journey, shelf, hero; b) man, woman, tooth, foot, goose, child, mouse, ox; c)postman, son-in-law, editor-in-chief, fisherman, schoolgirl, sister-in-law, text-book, pocket- knife, passer-by, statesman;

places, libraries, languages, dresses, flies, watches, clocks, countries, eyes, buses, bushes, parties, rays, thieves, companies, Negroes, masses, leaves, wolves, glasses, keys, boxes, halves, lives, days, plays, factories, cities, opportunities, colonies, roofs, months, journeys, shelves, heroes;

b) men, women, teeth, feet, geese, children, mice, oxen;

c) postmen, sons-in-law, editors-in-chief, fishermen, schoolgirls, sisters-in-law, text-books, pocket- knives, passers-by, statesmen;