For centuries, everybody knows laughter is the best medicine. Besides bringing joy, the doctor also 61 （believe） that laughter helps release stress, which is the cause of many diseases.
The celebration of World Laughter Day is 62 （mean） to bring good health, joy and world peace. It is a special day that can 63 （celebrate）annually by anyone on the first Sunday of May. All people need to do is laugh aloud and wildly. The fun event was started 64__ Indian physician, Dr, Madan Kataria.
His quest to make the world a happier place 65 （begin） in 1995, with the introduction of Laughter Yoga（大笑瑜伽课）, a fitness class 66 people practice breathing exercise and uncontrolled laughter.
Though only five students attended the first class, this fun way of exercising soon began to spread and in a short time it began to be held 67 more than 70 countries around the world.
Members get together every day or twice a week 68 exercise by simply laughing out loud, waving their hands and making funny faces each other to keep the laughing going.
In 1998, in an attempt to spread the laughter to every person, the physician declared the first Sunday of every May World Laughter Day. Not 69 （surprise）, it became an instant hit. To make it more fun, Dr. Kararia suggested 70 （organize） the celebrations in public places so that other people could join in. Some even awarded prizes to participants who could perform this feat in natural and effortless way.