Any famous poem about time is precious and life is precious will do.

Young people who don't work hard are pathetic.

Teenagers only know how to play, but don't know how to study hard. When they are old, they regret why they didn't know how to study hard when they were young.

When the flowers should be folded, we should fold them quickly, and don't wait for the flowers to wither before folding one.

Time is money.

There is a road in the mountain of books, but there is no limit to learning the sea.

Have fun!