На две группы нужно распределить countables: uncountables слова: mystery, knock, bread, hoof, murmur, information, mosquito, weather, carrot. candle, milk, toast, housework, mother, tongue, practice, idiom, vocabulary, play, advice, money, butter, coin, hair, paper, potato на две колоночки.

Countable:candle   hoof   mosquito    carrot   tongue     potato
все остальное uncountable

C       hoof , mosquito, carrot. candle,  toast,   mother, tongue, idiom, vocabulary, play,    coin,   potato , knock, mystery, murmur, practice

U      bread, , information,  weather,  milk, , housework, money, butter, hair, paper, advice, mystery