18across. pessimistic attitude. - - g - - - v - s -.
7down. Evolutionary sequence of events. - h - l - - - - - s - s
17down. Alien. - - - a - g - r.
thank you for all help...
23d. enclosed in box. C - S - - . 28a. make someone loose way. - S - R - E - T - T - . I must have something wrong as i have no idea of 28a to make 23d make sense. so thanks for help....