$1.$Find the common elements in two lists using a for loop:

list$1=[1,2,3,4,5,6,9,3,7,9]$

list$2=[3,4,5,6,7,65,4,7,3,2,8]$

$2.$Find the first occurrence of a number $8$ in a my$\_$list using a loop:

my$\_$list $=[3,7,9,2,80,45,34,78,8,2,7,90,93,12,46,8,34,8,4,90,4]$