第二部分、短文改错（共1题；每空1分，满分10分）
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：
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！
I went to the English Camp in London last summer
holiday. One day， my two good friends and I were on duties.  81. ________
When we finished cleaning classroom, it was about 8:50     82.________
in the evening. Then we prepare to go to students' dorm.  83.________
Inside the building， it was very dark. There was only the 84.________
moon and some small stars in the sky. In that moment，         85 ________                                              
we were all afraid. On our way to the dorm, one of my        86. ________                         
friends saw something on the ground and picked it up, said     87. ________                     
"Look, 100 pounds!" When we got to our dorm, we gave them      88. ________
to the teacher. Money is important, but money is not anything  89. ________                   
and cannot buy all what we need in the world.                 90. ________