以下标有题号的每一行均有一个错误，请找出，并按下列情况改正：
此行多一个词：把多余的词用斜线(\)划掉，在该行右边横线上写出该词，并也用斜线划掉。
此行缺一个词：在缺词处加一个漏字符号(∧)，在该行右边横线上写出该加的词。
此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。
I'm a senior three student. I often do bad in my  __________
exams, so I have been trying to catch up the others.__________
But I'm such concerned about my marks that sometimes   __________
I cannot eat or sleep well at a night. I'm afraid that   __________
I may get low marks in the tests again even if I work  __________
hard than before. I have no courage to face low marks. __________
I cannot fix my mind to my study, whenever I think of   __________
this. It is obvious that the worry had a bad effect on   __________
my school works. I'm feeling very sad. Would you  __________
please telling me how I should deal with my worry?   __________