$.$ Determine those pairs of words which contain a minimal pair $($minus $0\mathrm{.}5$ for each incorrect minimal pair$).$

$1.$ ban $$ bang

$2.$ lab $$ lip

$3.$ rich $$ ridge

$4.$ cat $$ pit

$5.$ ranger $$ danger

$6.$ afar $-$ agar

$7.$ lamp $$ limp

$8.$ tree $$ free

$9.$ cake $$ Katie

$10.$ race $$ pace