Fill in the words: plural or singular. Scissors, pliers, scales, clothes, pyjamas, trousers, police, goods, stairs, news, means, luggage, money, information, equipment, food, furniture, advice, billiards, dominoes, Physics, Maths

* Scissors — plural (always); * pliers — plural (always); * scales — plural (always); * clothes — plural; * pyjamas — plural (always); * trousers — plural (always); * police — plural; * goods — plural (always); * stairs — plural (always); * news — singular; * means — singular or plural; * luggage — singular; * money — singular; * information — singular; * equipment — singular; * food — singular; * furniture — singular; * advice — singular; * billiards — singular; * dominoes — plural; * Physics — singular; * Maths — singular.