题目内容：
根据以下材料，回答题本题要求改正所给短文中的错误。请对标有题号的每一行做出判断：如无错误，在该行右边横线上打一个勾(√)；如有错误(每行最多有一个错误)，在错的词下面画一横线，并在该行右边横线上写出改正后的词；如此行缺一个词，在缺词处加上一个漏字符号(∧)，并在该行右边横线上写出该加的词；如此行多一个词，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。
My mother is a teacher work in a key highschool.11._______
She is too busy that she often has to get up earlyand stay up late.12._______
In addition to this, she hardly has any times totake exercise.13._______
She has been on poor health for some time.14._______
My father and I are worried that she may fall ill ifshe works too hard.
These days I'm thinking why to develop my mother'sinterest in playing sports.15._______
Considered today is Mother's Day,16._______
I decided buy a pair of jogging shoes forher.17._______
I secret put them on the desk in herstudy.18._______
When my mother entered into her study this evening,she looked surprised,19._______
but she immediately realized my intention.
She promises that she would go jogging everyevening.20._______
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