The sum of an integer and its additive inverse is .

The additive inverse of $-1$ is _____

If $+16 m$ represents going $16 m$ to the north, then _____ $m$ represents going $16 m$ to the south.

The additive inverse of greater negative integer is _____

The opposite of $-32$ is _____

$-521+$_____$=-521$

$-102+\left(-102\right)=$_____

$475+\left(-24\right)=$_____

$\left(-3\right)-\left(-7\right)=$_____