For years we have believed we were either healthy or sick. 【C1】______ , during the mid-90s, scientists developed a new concept called "sub-health", a status 【C2】______ health and illness. The concept of sub-health has become 【C3】______ because it has helped to explain many health problems. 【C4】______ one study, only 5. 6% of people in the overall population are actually sick, 【C5】______ the sub-healthy group consists of about 60%, and the 【C6】______ population is considered healthy. 【C7】______ of one's sub-health will help one to be alert to the underlying disease and remain healthy. Sub-health is a state in which the body is 【C8】______ turning from health to illness or from illness to health. Our bodies are actively 【C9】______ the conditions of health, sub-health and disease. Factors 【C10】______ aging, internal or external toxicity (毒性) , and body or mind exhaustion may cause sub-heath, but taking good care of the body can change a sub-healthy status to a healthy one.