THE CHUNG Ying Theatre Company will celebrate its 15th anniversary next month with a mini-festival titled Studio Shorts 94 . Like the two previous instalments of Studio Shorts, this production will showcase the versatility of the Chung Ying actors, who handle all aspects of the show, from script-writing to directing, lighting and stage design. Studio Shorts 94 comprises four entertaining plays in contrasting styles. The plots of the witty ''The Dinosaurs'' and the touching ''Toto'' are taken from two novels, while the fast-moving ''Xiao Long Wen Lu'' and the sentimental ''Mirror, Mirror on the Wall'' are original works for solo actors. Studio Shorts 94 , to be performed in Cantonese, will be in two parts: Shorts 1: May 11-14, 7.45 pm (Wednesday to Saturday); May 14-15, 2.45 pm (Saturday and Sunday); Shorts 2: May 19-22, 7.45 pm (Thursday to Sunday); May 21-22, 2.45 pm (Saturday and Sunday). The venue is the McAulay Studio Theatre, Hong Kong Arts Centre, and tickets priced at $55 are available at Urbtix outlets. For reservations, call 877-1000 or 734-9009, and for more information, 521-6628.