Of the three paper flowers, the red one is the_________.

—Today is the _____ day in my life, because I won the first prize in the competition. —Congratulation!

Someone says "Time is money. ” But I think time is _________ important than money. 

—Why don’t you drive to work today?—Sometimes riding is even          than driving during the busy traffic time.

If there are _______ people driving, there will be ______ air pollution.