题干
假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单同的增加、刪除或修改。
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。
As a student, I have taken a great many of exams. Whether I have been good prepared or not, I will keep calm and confidently. That is because I know the purpose of exams is to find out the knowledges we can't understand. Therefore, there was a time when I was afraid of exams. I was afraid that I couldn't get high marks or fail the exam, I would be laughed at by others. Later, my teacher, she realized my problem, had the face-to-face talk with me. After I followed the advice giving by my teacher I finally overcame my fear.
答案(点此获取答案解析）
①把of去掉；②good→well；③confidently→confident；④knowledges→knowledge； ⑤Therefore→成However； ⑥that后面加if； ⑦fail→failed ； ⑧she→who； ⑨the→a； ⑩giving→given。
的值等于 ( )