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。
Last winter vacation, some of my classmates decide to 1.
travel with their friends, while I chose to take par-time job 2.
to gain experience and earn some money. I learned from my 3.
teacher that a nearby company was looking after students 4.
with good handwriting to write address on envelope. The 5.
pay were 10 cent per envelope. I headed for the company, 6.
feeling sure I would easy finish 300 envelops in five hours and 7.
to earn the money. Actually, I only finished 200. Now, I 8.
fully understand how hard is to earn money. Getting out 9.
of the classroom is indeed necessary for we all. 10.