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：把多余的词用斜线（＼）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限一词;

2）只允许修改10处，多者（从第11处起）不计分。

    One day, in my way to school, I noticed two anxious foreigners was surrounded by a group of people. I stopped and found that they were tourist from Canada who carelessly left a very importantly wallet in a taxi. So I take them to the nearest police station. With help of the policemen, we got in touch the taxi company. We were telling that the wallet had just been found. And two passports, flight tickets, or some money were still inside it. Finally the two Canadians got our wallet back. They thanked for me and left.

小明曾经梦到下列情景：这里经济繁荣，尤其工商业发达；在学校一大群淘气的男孩学习各种技能；来到一个圆形广场，他又看到一群成年男人在讨论是否对外战争。醒来后，他不知究竟是到哪里梦游了一圈，你能告诉他（    ）

唐多令

刘过

芦叶满汀洲，寒沙带浅流。二十年、重过南楼‚。柳下系船犹未稳，能几日，又中秋。

黄鹤断矾头，故人今在否？旧江山、浑是新愁。欲买桂花同载酒，终不似，少年游。

【注】①刘过：南宋爱国词人，号龙洲道人，曾多次上书朝廷，屡陈收复中原大计，但不被朝廷重用。②南楼：楼名，在武昌，二十年前词人与故人到此登楼揽胜，武昌当时是抗金前线。

如图示PA、PB是⊙O的切线，切点分别为A、B，直线EF也是⊙O的切线，Q是切点，交PA、PB于E、F点．若PA=10cm，则△PEF的周长为 ____cm；若∠APB=50°，则∠EOF的度数为 ____

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