The product of a rational number and its reciprocal is

Zero has _____ reciprocal. (no/ one/ two/ infinite)

The number $1$ and _____ are their own reciprocals.

Zero is _____ the reciprocal of any number.

The reciprocal of  $\mathrm{a}$ where $\mathrm{a}\ne 0$ is _____

The reciprocal of a positive rational number is a _____ rational number.

The reciprocal of a negative rational number is _____

Simplify and write the answer in the standard form: $\frac{4}{9}÷\frac{-5}{12}$

Simplify: $-8÷\frac{-7}{16}$