When I was a young man I had much ego (自负). I thought I 1 everything. I looked forward to fame and success. I can even remember once in college2 telling one of my friends: “If only everyone listened to me, then they would all be happy.” I 3 left school, ready to take on the world. Little did I know the world was about to take on me.

    In the 4following college, instead of success, I found struggles. I had 5 in finding work. My jobs were either temporary or were 6 badly. When my wife and I had children, we were 7 to learn that both of our sons had Autism (自闭症) and would need to be 8 for the rest of their lives. I had no 9why this had happened to us.

    In time, however, I began to 10. My ego was decreasing fast. Instead of success, I found my 11 in moments of love. Playing and 12 with my sons brought me so much happiness. My boys 13me more about peace, patience, joy and love than I could have ever learned on my own. I began to share the 14I learned through my writings and my life. I finally realized that my 15 in this world had nothing to do with fame or success.16 it had everything to do with allowing love and light into my life and 17 it with everyone I could.

    You may not be happy 100% of the time18 can be in this world. Yet, you will find a joy no earthly (世俗的)19 could ever give. Put all of your moments, days, and years to good use then20 them with love.

如图，在四棱锥P﹣ABCD中，AB⊥PA，AB∥CD，且PB=BC=BD=$\sqrt{6}$，CD=2AB=2$\sqrt{2}$，∠PAD=120°，E和F分别是棱CD和PC的中点．

求证：平面BEF⊥平面PCD

2016年，全国人民代表大会已经走过了一个甲子的光辉历程。60多年风雨兼程，从“豆选法”到城乡选举“同票同权”，从等额选举到差额选举，人民代表大会制度在不断完善。坚持和完善人民代表大会制度与时俱进，是全党全社会的共同责任。这体现了（　　）

①坚持党的领导、人民当家作主、依法治国的有机统一

②人民代表大会制度是保障人民民主的根本政治制度和权力机关

③人民民主的真实性和中国特色社会主义的制度自信

④人民民主专政是社会主义民主政治的本质和核心。