请教一道高中英语短文改错题?十分感激·

请教一道高中英语短文改错题?十分感激·
I always wanted to be great scientist.I had some dreams _____
of discovering a new drug that would save the life of hundreds ____
of people.Unfortunate,I was nener very good at chemistry _____
at school but the teacher used to get very angry with me. ______
After a while,Idecided I would become an inventor and designed __
an amazed new product which would become a household _____
brand.My parents encouraged me,but told me to be a little _____
more realistic.A few weeks late,I had a brilliant idea for a pen ___
that could write with upside down.To my disappointment,a ____
friend of me pointed out that it was not a new invention. _____
只有一行是对的,其余每一行都有一个错误.