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课外活动的基本特点是灵活性、自愿性和（）。
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As Christmas is coming, there are presents to be bought, cards to be sent, and rooms to be cleaned. Parents are ___1___ with difficult jobs of hiding presents from curious young children. If the gifts are large, this is sometimes a real ___2___. On Christmas Eve, young children find the excitement almost unbearable. They are torn between the wish to go to bed early so that Father Christmas will bring their presents quickly and the wish to stay up late so that they will not miss the fun. The wish for gifts usually proves stronger. But though children go to bed early, they often lie awake for a long time, hoping to get a short ___3___ at Father Christmas. Last Christmas, my wife and I successfully hid a few large presents in the storeroom. I ___4___ the moment when my son, Jimmy, would ask me where that new bike had come from, but ___5___ he did not see it. On Christmas Eve, it took the children hours to go to sleep. It must have been nearly ___6___ when my wife and I went quietly into their room and began filling stockings. Then I pushed in the ___7___ I bought for Jimmy and left it beside the Christmas tree. We knew we would not get much sleep that night, for the children were ___8___ to get up early. At about five o’clock the next morning, we were woken by loud sounds coming from the children’s room — they were shouting excitedly! Before I had time to get out of bed, young Jimmy came riding into the room on his new bike, and his sister, Mary, followed close behind pushing her new baby carriage. Even the baby arrived. He moved ___9___ the hands and knees into the room dragging a large balloon behind him. Suddenly it burst. That woke us up ___10___. The day had really begun with a band! ___6___内应选（）
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根据GSP的要求，在库药品实行色标管理，退货药品应挂
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计价器失准、空调器损坏或车辆需检修时不得载客或（）。
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浇注20MnSi使用AlC水口，使用寿命控制在（）较为合理。
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根据Fe-O相图得知，FeO实际为FexO，在1000℃时碳素溶解损失及水煤气反应，升始明显加速，故将1000℃左右等温线作为炉内（）的分界线.
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全竞争市场
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测交流电压过零间隔可得电网（）
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工艺尺寸链的封闭环是（）。
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评价医德行为善恶的根本标准是（）。