短文改错 （每小题1分，共10分，注意格式）
此题要求改正所给短文中的错误。对标有题号的每一行做出判断：如无错误，在该行右边横线上画一个勾(√)；如有错误（每行只有一个错误），则按下列情况改正：
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。注意：原行没有错的不要改。
At the age of fourteen Bell sent to London to                                    1._________
live for a year with his grandfather, that took good care                      2._________
of him. A year late young Bell returned to Scotland. 　　　　　　　　 3._________
After working for time with his father, he began teaching 　　　　　　 4._________
speech at a school. His free time was devoted to study　　　　　　     5._________
sound.Before he studied the human voice and the　　　　　　　　       6._________
vibrations（振动）that goes to make up sound, he found that the 　       7._________
voice is not a simple thing. So he continued on with his 　　　　　　     8._________
studies and his teaching until at the age of twenty-third 　　　　　       9._________
he moved with his family to Canada. 　　　　　　　　　　　　　　10._________