词语填空（共10小题，计10分）
用方框中所给单词的适当形式填空，使短文通顺、正确、连贯（每个单词限用一次）。

little  while  by   healthy  help  serious  long  patient  find  make

There is an old saying in English, “Laughter is the best medicine”. Until recently, few people took the saying very  . However, doctors have begun to study laughter and the effects(影响) it has on the human body. They have found the truth that laughter can really improve people’s  
Tests were carried out to study the effects of laughter on the body. People watched funny filmsdoctors checked their bodies. It wasthat laughter has similar effects to physical exercise. If laughter exercises the body, it must be.
Other tests have shown that laughter also makes the body feelpainful. In one experiment , doctors produced pain in groups of students who listened to different radio programs. The group which listened to a funny program could bear the pain for thetime.
As a result of these discoveries, some doctors in the United States now hold laughter clinics(诊所), in which they try to improve theirhealth by encouraging them to laugh. They have found that even if their patients do not really laugh,them smile is enough to produce good effects similar to those causedlaughter.