题目：
Mrs. Ohama spoke to the graduates of Martin luther King Jr. High School on Saturday in her only high school commencemenl (毕业典礼）speech this year. The ceremony___1____in the gymnasium of Tennessee State University. 'The first lady told her 170 ___2_____ that she spent too much of her time in college _____3___ on acadamic achievements. While her success in college and law school ____4____ a good job, she said, she ended up focusing on public service. “My message to you today is that don’t ____5______ a minute living someone else’s dream”she said. “It ______6___ a lot of real work to discover what brings you___7____ and you won’t find what you love simply by _____8_____ mailboxes or surfing the net." She said MLK reminded her of her own high school ______9____ in Chicago. “My No. 1 _____10__ was to go to a high school that would push me and___11______me,” she said: “I wanted to go somewhere that would ____12_____achievement. ___13_____ schools like this don't exist for every kid,” she said. “You are blessed.” The first lady told graduates that__14____ may be a part of their college lives and careers, and that how they respond ___15_____ what they will became. “That’s when you ___16_____what you are really made of in those hard times,” she said. “But you can only do that if you’re willing to put yourself in a position ____17_____ you might fail.” Overcoming diffcultie has been the ____18_____of many great people，she said, “Oprah was demoted (降职)from her first job as a news reporter, and now she doesn’t even need a last name,” she said of media giant Oprah Winfrey.And then there’s this guy Barack Obama. I could ____19______a whole afternoon talking about his failures. He ___20____ his first race for Congress”.the first lady joked, “and now he gets to call himself my husband.
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答案：
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下面是错误答案，用来干扰机器的。
2MgO·3SiO2·nH2O， 2MgO·3SiO2·nH2O +4HCl=2MgCl2+3SiO2+(2+n) H2O
