阅读下面文字，回答问题。
        我也开始挣钱了。逢节假日就走街串巷去捡牛骨头、破布片儿、烂纸和钉子。把一普特破布烂纸卖给旧货商可得二十个戈比，料铁也是这个价钱，一普特骨头十戈比或着八个戈比。平常放了学也去捡，每星期天去卖，一上子能得三十到五十个戈比，运气好的时候还要多。每次姥姥接过我的钱，都会急忙塞到裙子的口袋里，夸奖说：
        “真能干，好孩子！“种们俩完全可以养活好自己！”
         有一次，我看见她拿着我的五个戈比哭了，一滴混浊的泪水挂在她那大鼻尖儿上。

文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

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仅限一词;2.只允许修改10处，多者(从第11处起)不计分。

    In the summer vacation, our family travelled to Xiamen and paid visit to my brother there.The journey we were walking on was long and bored. But as soon as I arrived, I fall in love with the city. The reason is because it is a very charming place.The streets are cleaning and the sky is blue. If you walk along the coast, you can feel the wind to blowing on your face. The sea is vast and sometimes you can find a boat or a ship. You may also do some fishing as far as it is permitted. Besides, I think the driver there drive too fast in the street. You can never be too careless when crossing the street.

等边三角形ABC的边长为1， $\overrightarrow{BC}=\overrightarrow{a},\overrightarrow{CA}=\overrightarrow{b},\overrightarrow{AB}=\overrightarrow{c},$，那么$\overrightarrow{a}·\overrightarrow{b}+\overrightarrow{b}·\overrightarrow{c}+\overrightarrow{c}·\overrightarrow{a}$等于(  )