Fill in the blanks:
(i) Zero has --------- Reciprocal.
(ii) Thes ---------- and --------- are their own reciprocals.
(iii) The reciprocal of -5 is ------------
(iv) Reciprocal of 1/x, where x ≠0 is -------------
(v) The product of tworational s is always a -------------
(vi) The reciprocal of a positive rational is -------------