Bonjour,
Réponse :
a. a party at the end of the school year: the prom
b. an elegant suit for the prom: a tuxedo ( un smoking )
c. the group of teachers in a school: the faculty
d. a student in 9th grade: a freshman
e. be a member of a club: to fellow a club ( être membre d’un club )
;)
Explications :
9th grade ( US ) = 3ème en France