The acoustics of the room have been improved and are now excellent . Gymnastics is just one of her many hobbies . Economics is taught in the sixth form, but politics is not on the curriculum . In other contexts, the same nouns may become plural, when they refer to a system, set of principles, group of activities, etc. His politics are very left-wing .
Nouns relating to behaviour, such as heroics and hysterics , are usually plural.
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