Stress is difficult to define or measure．Some people enjoy a busy lifestyle and are able to deal well with life crises．（61）___people feel tensed or stressed by the slightest deviation from their set daily routine．Many people fall somewhere （62）___between，but may have periods when levels of stress increase．

You may have many signs if your stress builds up．For example，you won't be able to sleep properly（63）___worries going through your mind．You can be（64）___（patience） or irritable at minor problems．You may not be able to concentrate due to many things going through your mind．Some may lose their appetite and don't feel like （65）___（eat）．In addition，you will be unable to relax，and always feel that something needs（66）___（do）．

Ongoing stress （67）___ （think） to be bad for health，although this is difficult to prove．Stress may also contribute to other physical illnesses in many ways which are little（68）___（understand）．For example，it is thought that many physical problems and other conditions are made （69）___ （bad） by an increased level of stress．Besides，your work performance，and relationships，may also be affected by stress．（70）___，we should try our best to get rid of our stress and live more comfortably．