5. write the plural of the following nouns: a teacher a man a tooth a louse a life a potato a city an analysis a mosquito a deer a sister-in-law a myth a key a glass a bush a tariff a story a watch a zoo an a grown-up a scarf a box an knife a fox a mouse a roof a postman a forget-me-not a factory a day a studio an ox a thief a hero a prize a foot a kiss a donkey a loaf a stimulus a curriculum a brush a wife a guest a tomato a wreath an employee