此题要求改正所给短文中的错误。短文中有10处错误，每句最多有两处。错误设计一个单词的增加、删除或修改。
增加：在缺词处加一个漏词符号（∧），并在此符号下面写出该加的词。
删除：把多余的词用斜线（﹨）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1、每处错误及修改均仅限一词。
2、只允许修改10处，多者（从第11处起）不计分。
When my father bought a computer as birthday gift for me in last year, I
felt very excited. As is known to us all, computers are getting more and more
usefully now. Much information can be stored in it. We can also learn that
has happened lately in the world on the Internet. In the past, people had to do
lots of work that were very dangerous. But now computers can do it, instead. When an exam is coming, I often did some exercises in my computer. Then it will correct them and tell me the right answer. In this way it is very convenient for me to get ready for the exam than before.
