Fill in the blanks. 

(i) Zero has [[1]] reciprocal. 

(ii) The numbers [[2]] and [[3]] are their own reciprocals 

(iii) The reciprocal of – 5 is [[4]]. 

(iv) Reciprocal of 1/x , where x ≠ 0 is [[5]]. 

(v) The product of two rational numbers is always a [[6]]. 

(vi) The reciprocal of a positive rational number is [[7]].