mega 80 mega-mix

am stuck on three namely:-
5 dn the clue is Mediocrities have no intestine disorders (11) I have N?N?????I?S.
39 ac the clue is Any language used by speakers who dont share the same language (6.6) I have ?I?G?A???N?A.
35dn The clue is Intelligence to encourage man who messes with your head(5.7) I have ???I?S?P?E?N.
Come on Cherrie,Lustig or Jespah watcha reckon.philcottie.