I did the singer and natural law questions, for the natural law questions I just showed how it had aspects of absolutism and relativism and deontology for the part A and then for the part B i talked about how without the synderesis principle there cannot be apparent goods so we consciously sin and then talked about how without without the aspect purpose we cannot have the primary precepts and this the secondary precepts.
For the singer question I talked about lower order and higher order beings and the replacement argument and then applied it to abortion and euthanasia, for part B i talked about how rule was easier to apply but was less accessible and that both didn't pay regard to special consequences, didn't really know what to write to be honest.
I hope what I wrote answered the questions, I don't even know if it was all that relevant but I hope its enough for an A, what did you guys write for theses questions ?