（Ⅰ）根据以上尺规作图的过程，求证：四边形ABEF是菱形；

（Ⅱ）若菱形ABEF的周长为16，AE=4 $\sqrt{3}$ ，求∠C的大小．

增加：在缺词处加一个漏字符号( )，并在其下面写出该加的词。

删除：把多余的词用(＼)划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

Dear Jack,

    Next Saturday will my birthday. I'm going to hold a birthday party at home on the evening. It will start at 7:30. Some classmates as good as some foreign friends have been invited. The activities include singing, dancing and sharing interesting experiences. Surely, we'll have a good time. I would feel honoring if you could come. I live at 656 Minzu Street. You can take Bus No. 11 or No. 15 and got off at the stop of Guang Ming High School. Justly on the opposite side is my house, what is red with a white door. I'm sure of you can't miss it. I do hope they will come.

    Best wish.

Yours,

LiHua

列举解放战争时期和平解放的两个城市。