根据短文内容和所给汉语提示，写出短文空白处各单词的正确形式。每空限填一词。
    At school many things happen to us. We may feel ____ （激动的）when we succeed in a school play. We may feel sorry if we lose an important ____ （比赛）. We want to keep the memory in our lives. How to keep memories? Our teacher, Mr. Smith, has taught us how to____ （记住）things to make our own yearbook. A yearbook is a ____ （种） of book which is used to memory wonderful moments. It’s usually made at the end of year. Last ____ （十二月）, we began to make our yearbook. ____ (首先) we chose the persons that had done something ____ （特殊的）, then some ____  （学生） interviewed them, some ____（写）down their stories, others took photos of them. Finally our teacher helped us to put the things ____ （一起）. Then we had our first yearbook.

方案甲：员工最多有两次抽奖机会，每次抽奖的中奖率均为 $\frac{4}{5}$ ，第一次抽奖，若未中奖，则抽奖结束，若中奖，则通过抛一枚质地均匀的硬币，决定是否继续进行第二次抽奖，规定：若抛出硬币，反面朝上，员工则获得500元奖金，不进行第二次抽奖；若正面朝上，员工则须进行第二次抽奖，且在第二次抽奖中，若中奖，则获得1000元；若未中奖，则不能获得奖金．

方案乙：员工连续三次抽奖，每次中奖率均为 $\frac{2}{5}$ ，每次中奖均可获得奖金400元．

（Ⅰ）求某员工选择方案甲进行抽奖所获奖金X（元）的分布列；

（Ⅱ）试比较某员工选择方案乙与选择方案甲进行抽奖，哪个方案更划算？

（Ⅲ）已知公司共有100人在活动中选择了方案甲，试估计这些员工活动结束后没有获奖的人数．

算一算下面图形的周长．

周长=____

周长=____