Fill in the blanks:
1)The product of a rational number and its multiplicative inverse is _____.
2)The reciprocal of a  reciprocal of a number is ______.
3)The sum of a rational number and its ______ is equal to 0.
4)The quotient when non-zero rational number is divided by its additive inverse is______.
5)If a and b are two rational numbers then _______ is a rational number lying between a and b.