1a.stoned,sending mail,just behind someone else?(6,2,3,4)P?P???A???E?O??
10a.pupil's say,in exercise(7)??O?E??
12a.expression of disagreement has a bearing in counter manoeuvring(2,9)A?C???R?I??
18a.still fighting ulcers-set for treatment(9)T???E????
thanks in advance/some of the letters may not right