There is an English saying: “Laughter(笑) is the best medicine.” Until recently, few people took the saying     1    . Now however, doctors have begun to look into laughter and the effects it has on the human body. It can decrease(降低) people’s blood pressure, the heart beating and breathing. It also works the stomach and even the feet. So laughter exercises the body and     2     people’s health. As a result of these     3    , some doctors in the United States now hold laughter clinics(诊所), in which they help to improve their patients’ condition     4     encouraging them to laugh. They have found that even if their patients do not really feel like     5    , making them smile is enough to produce beneficial effects similar to those caused by laughter.