A serviceable repertoire of eight one-act plays that range from light slapstick to the unbridled melodrama of You Have To Stay On The Horse in which a terminally ill Joan Crawfordish careerwoman tries to make amends with her estranged son. Bradley is best when she plays for laughs as in The Bracelet Engagement, a broad farce about a caddish Hollywood Casanova of the Twenties. But school drama groups will also have fun staging her heavily ironic Roll of Nickels (it's set in a Las Vegas hotel-casino) and budding Thespians will grab at the chance to really ham it up in an ersatz-Twilight Zone episode called The Last Bus From Lockerbee. It's unfortunate that so few juicy parts are written for boys and that so many times the curtain falls after a hokey moral has been hammered home. Still, performed in front of a captive audience of parents, teachers, and classmates, these simple-to-stage dramas are more than likely to draw enthusiastic notices.