Last few to get as the brain's given up the ghost! 17a Animal in river taking oxygen for energy (5) R?I?? 22a Refusal at Badminton, say (3) N?? 24a Pirate used it to snub girl (7) C?(D?)?A?? 18d Poem about Ulysses essentially at end of Troy (7) ??????Y and 25d Couple brought up anything from the north (3) ??O - Duo? I'm sure the answers are obvious and the crossword has been really easy today - I haven't seen many asking the questions - but I cannot get my head around it for some reason! Many thanks in advance.