在△ABC中，角A，B，C的对边分别是a，b，c， $a=2\sqrt{2}$ ， $\sin C=\sqrt{2}\sin A$ ．

（Ⅰ）求边c的值；

（Ⅱ） 若 $\cos C=\frac{\sqrt{2}}{4}$ ，求△ABC的面积．

中华民族有助人为乐和扶贫济困的优良传统，“有困难找义工，有时间做义工”。下列属于公益活动的有（    ）

①向居民宣传交通法规      ②依法纳税     

③参加义务植树                  ④在家里打扫卫生

以下五家银行行标中，既是中心对称图形又是轴对称图形的有（    ）

根据上下文内容填空。

cat    afraid      shadow    sees     plays     again     takes

      Kitty the cat is lovely. She ____ a walk in the morning. Then she ____ a black shape behind her. She thinks it's a big black ____. She is ____. She runs. The black shape runs too. She stops, the black shape stops too. She runs, the black shape runs ____. “Oh, it's my ____ !”Kitty says. At last, she is happy. She ____with her new friend together.