如图示PA、PB是⊙O的切线，切点分别为A、B，直线EF也是⊙O的切线，Q是切点，交PA、PB于E、F点．若PA=10cm，则△PEF的周长为 ____cm；若∠APB=50°，则∠EOF的度数为 ____

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   Stress is everywhere in our everyday life. Not only men have it, but also women and young people.
   The most important reasons of stress are: death, diseases, exams, making money, getting married, moving houses, changing jobs, ending friendships and so on.
   How do you know whether you have stress or not? Could you give your answers to the following questions?

   If your answer "Yes" to more than two of these questions, you are one of those people with stress. So what can you do about it?
   Doing relaxing exercises, talking with friends and listening to light music are all usual ways of relieving (减轻) stress. However, doctors now say that there are easier ways-people should laugh and smile more often. When you laugh and smile, your body relaxes. They also say that people, especially men, should   X  more often, because crying is a natural way of relieving stress.

当我们的受教育权受到侵犯时，我们可以采取如下哪些非诉讼方式予以维护（    ）

①寻求老师、亲友的帮助             ②向当地妇联、教育主管部门等反映

③寻求新闻媒体的帮助和支持    ④向人民法院提起诉讼

句意及汉语提示完成单词。