根据首字母提示，完成短文填空。

       Cannon has shown a great interest in collecting flags. At the young age of four, Cannon began studying flags, d____ them in his coloring books and putting them up on his walls. Throughout school, he studied flags and tried to find out all he could about them. After university, Cannon s____ to be a lawyer. Throughout law school, he continued to collect flags. His classmates, friends, and family started c____ him “the flagman.”

      Cannon now has more than 200 flags in his collection. He shows many of them in his downtown law office. Once he d____ country flags for an exhibition on the Olympics.

       In addition to collecting flags, Cannon also w____ about them. He has published three books about flags. He loves to h____ from friends who see his b____ in stores all over the world. A few years ago, Cannon's hobby r____ a new level. He entered a flag design contest and won. The country he lives in asked him to design its f____. Cannon explains his hobby this way, “Collecting flags is l____ collecting pieces of history.”

岳飞

       或问：“天下何时太平？”飞曰：“文臣不爱钱，武臣不惜死，天下太平矣!”师每休舍^①，课^②将士注坡^③跳壕，皆重铠以习之。卒有取民麻一缕以束刍^④者，立斩以徇^⑤．卒夜宿，民开门愿纳，无敢入者。军号“冻死不拆屋，饿死不掳掠”。卒有疾，亲为调药。诸将远戍，飞妻问劳其家；死事者，哭之而育其孤。有颁犒，均给军吏，秋毫无犯。善以少击众。凡有所举，尽召诸统制^⑥，谋定而后战，故所向克捷。故敌为之语曰：“撼山易，撼岳家军难。”每调军食，必蹙额^⑦曰：“东南民力竭矣!”好贤礼士，雅歌投壶^⑧，恂恂^⑨如儒生。每辞官^⑩，必曰：“将士效力，飞何功之有!”

（节选自《续资治通鉴•宋纪》）

     【注释】①休舍：休息。②课：督促。③注坡：从斜坡上急驰而下。④束刍：捆束喂牲口的草。束，捆。刍，喂牲口的革。⑤徇：示众。⑥统制：当时的武官名。⑦蹙额：皱眉愁苦的样子。⑧雅歌投壶：唱雅歌，做投壶游戏。这里形容儒将风度。⑨恂恂：谦和的样子。⑩辞官：这里指辞谢升官。

如图甲：⊙O的直径AB=2，圆上两点C，D在直径AB的两侧，使∠CAB=$\frac{\mathrm{\pi }}{4}$，∠DAB=$\frac{\mathrm{\pi }}{3}$，沿直径AB折起，使两个半圆所在的平面互相垂直（如图乙），F为BC的中点，根据图乙解答下列各题：

（Ⅰ）若点G是$\stackrel{\wedge }{BD}$的中点，证明：FG∥平面ACD；

（Ⅱ）求平面ACD与平面BCD所成的锐二面角的余弦值．