四、短文填空：在下面短文的空格中填入适当的词，每空只许填一个 词。

To many of his teachers,Thomas Edison was not a good student 1 school,as he asked a lot of 2 that had nothing to do 3 his lessons.His teacher said he wasn't very bright and that he wasn't worth 4 .He had to leave school after only three months.That was all the school education he ever 5 .

His mother,however ,had been a teacher before she married.She 6 him at home.The boy was soon reading books 7 grown-ups.He showed special interest in science.

By the time he 8 ten , he was already doing experiments in

chemistry.He 9 vegetables in his garden and sold them to 10 the chemicals he needed.