Imagine you are a classic author, away from home for his or her first time. Naturally, you keep a diary in the unique style that will later endear you to so many readers. Send us a passage from this diary of an imaginary journey. Only one per entrant, please, and no more than 100 words. None can be returned. Address: The Home Forum Competition, The Christian Science Monitor, One Norway Street, Boston, Mass. 02115. Entries received by June 24 will be considered for certificates to be announced July 15.