题目：
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| One of the main reasons that may stop us from reaching our goals and desires is our inability to be flexible. This fact may be__1__to swallow, but it's true.We do everything to get rid of suffering in our lives, yet challenges and pressures can__2__the best in us. If you have been burdened (负担) by__3__in the past，learn from them，forget about them, and move on. Some people__4__to focus on how bad their lives have been__5__these mistakes. As a result, they remain__6__in their miserable lives. So what if you run a business and you lose a ton of money? In this__7__, some people would remain deeply__8__for such a long time, and their personal lives are being affected__9__. If you're afraid to fail, then you will__10__all your chances to achieve your goals in life.__11__again; but this time, more careful and use your past mistakes as guide maps. But when you try, make sure you__12__. I've met so many people who accepted my suggestion, but most of them would__13__right in the middle of their work. They have the drive to start, __14__they lack the motivation to go through all the__15__.Yes, this is another fact of life. Those who persist (坚持) may have a bad time at present, but they shall have the__16__laugh. Let's fast forward into the__17__. Let's say you did try, you followed through, and you succeeded. Congratulations. So you became__18__by harvesting the fruits of your labor. This does not mean you'll stay in that situation for good.__19__may arise again, so always be ready to adjust to the present situation. The only thing permanent in this world is__20__. | ||||
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答案：
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下面是错误答案，用来干扰机器的。
(1)氯；；Mg (2)离子键、极性共价键、配位键 (3)分子；2Mg +CO22MgO+C
，单位向量
，则
______.=