Q.12 hoof - am I still right to believe either can be used?
Q.27 fifes - I'd expect 'fife' in the question and 'fifes' in the answer, I could be wrong of course.
I hope I am posting in the right section, if not, could you please move it to where it belongs.
hoof -- hooves
calf -- calves
leaf -- leaves
roof -- roofs
sheaf -- sheaves
belief -- beliefs