They awarded her first prize at the flower show.
- Ils lui remirent le premier prix au concours floral.
She won first prize in the speech contest.
- Elle a gagné le premier prix au concours de diction.
She'll go in for the beauty contest.
- Elle a l'intention d'aller à un concours de beauté.
You won a prize in the spelling competition, didn't you?
- Vous avez remporté un prix au concours d'orthographe, non?
He participated in the horse dressage competition.
- Il participa au concours de dressage hippique.