Задание
Choose if the nouns are singular or plural
Some nouns are used only in the singular, even though they end in -s.
- economics [singular|plural]
- gymnastics [singular|plural]
- headphones [singular|plural]
- aerobics [singular|plural]
- pyjamas [singular|plural]
- trousers [singular|plural]
- news [singular|plural]
- clothes [singular|plural]
- measles [singular|plural]
- binoculars [singular|plural]
- classics [singular|plural]
- belongings [singular|plural]
- stairs [singular|plural]
- mathematics [singular|plural]
- business [singular|plural]