TEACHER'S DAY

I THINK TEACHER'S DAY IS A DAY YOU SHOW YOUR TEACHER HOW YOU WANT TO THANK YOUR TEACHER FOR TEACHING YOU. AND EVERY TEACHER'S DAY, PUPILS ALWAYS WANT TO BUY CARDS FROM SHOPS.BUT WHAT I WANT TO UNDERSTAND IS WHY BUY A EXPENSIVE CARD WHEN YOU CAN MAKE A HOME -MADE CARD???...............