Misc: What's the middle day of a non-leap year?

Questions

issac asimov is the only author to have a book in every ---------- -decimal category?

---------- , jack klugman, diana ross, carol burnett and cher have all worn braces as adults?

jill st. john, ---------- , diana ross, carol burnett and cher have all worn braces as adults?

jill st. john, jack klugman, ---------- , carol burnett and cher have all worn braces as adults?

jill st. john, jack klugman, diana ross, ---------- and cher have all worn braces as adults?