A teen wrote to his father :
$chool i$ really great. I am making lot$ of friend$ and $tudying very hard.
With all my $tuff, I $imply can't think of anything I need.
$o if you would like, you can ju$t $end me a card, A$ I would love to hear from you.
His father replied :
I kNOw that astroNOmy, ecoNOmics, and oceaNOgraphy are ENOugh to keep even an HoNOurs student busy.
Do NOt forget that the pursuit of kNOwledge is a NOble task, and you can never study eNOugh.