1. /z/ : rooms , dogs, beds, tables, chairs, televisions, pictures, fridges, cookers, vases, windows, photos, attics, villas, walls, shelves.
2. /iz/ : houses, boxes, dishes, vases, wishes, sandwiches, classes
3. /s/ : lamps, toilets, apartments, books, baths, chopsticks, lights, parents, clothes, plants, tablecloths, tourists