短文改错（共10小题；每小题1分，满分10分）
改正下面短文中的错误。对标有题号的每一行作出判断：如无错误，在答题卡该行右边横线上画一个勾（√），请在有错误的地方增加、删除或修改某个单词。
注意：1.每处错误及其修改均仅限一词；
2.原行没有错的不要改。
Although the first computer was only introduced
to China in the mid-1950s, since then ,a number of computers       1._____
used in different fields has been grown rapidly.                     2.______
Computers are now affected millions of people in countless ways       3.______
every day. They are used to predict the weather, examine the           4.______
ocean,and to develop defence systems. They depend more and more   5._____
heavy on computers. There is no reason to think that their use         6._____      
will decrease.By the contrary ,they will develop more rapidly            7. ______
as you think.If you are among those who still don't know much               8.______
about computers, you will lost in the future.                               9.______
You should learn what you can while you still have the chance               10.______