假如英语课上老师要求同学们交换修改作文，请你修改你同桌写的以下作文，文中共有10处语言错误，要求你在错误的地方增加、删除、或修改某个单词。
增加：在缺词处加一个漏字符号（^），并在其下面写上该加的词。
删除：把多余的词用斜线（＼）划掉。
修改：在错词的下面划一横线，并在该词下面写上修改后的词。
注意：
1．每次错误以及修改均限一词；
2．只允许修改10处，多者从第十一处起不计分。例如：
The temple stands nearby the city. It dated from 1961 and is 50 meters in high. It is one of the most famous temple in the country and about 5,000 tourists come to visit every year. Five years ago, people decided to repair the temple, but this work was completed last year. The ground floor has been complete painted, and the roof, too. All the rooms has been protected from birds by fixed wires across the windows. Trees and flowers have been planted around the temple. We believe, in a few years, the temple will take on new look.
MnCl2+Cl2↑+2H2O ，因此盐酸应当具有的性质是