For centuries, everybody knows laughter is the best medicine. Besides bringing joy, the doctor also    1    (believe) that laughter helps release stress, which is the cause of many diseases.

The celebration of World Laughter Day is    2    (mean) to bring good health, joy and world peace. It is a special day that can    3    (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    4    Indian physician, Dr, Madan Kataria.

His quest to make the world a happier place    5    (begin) in 1995, with the introduction of Laughter Yoga (大笑瑜伽课), a fitness class    6    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    7    more than 70 countries around the world.

Members get together every day or twice a week    8    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    9    (surprise), it became an instant hit. To make it more fun, Dr. Kararia suggested    10    (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.