假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写得以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加，删除或修改。
增加： 在缺词处加一个漏字符号（ ∧ ），并在其下面写出该加的词。
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. 每处错误及其修改均仅限一词；
2． 只允许修改10处，多者（从第11处起）不记分。
Yesterday my friends or I visited a model high school. We start our visit from the main
building. First we went to the lab building in that some students were doing experiments. Then we entered in the lecture hall behind the lab building and saw many students listen to a lecture given a professor. Next to the lecture hall was the art center. There they watched groups of students playing musical instrument. On the playground some boys were playing the football. It was so exciting that we couldn’t help cheer for them. It was really an impressive visit. or 改成and
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(答案→)or 改成and
解析：
【小题1】我朋友和我是并列关系：or 改成and
【小题2】这篇文章用过去时start 改成started
【小题3】考查定语从句，先行词是the lab building 定语从句是介词+which：in that 改成in which
【小题4】enter是及物动词，不加介词：去掉in
【小题5】考查词组：see sb doing，listen 改成listening
【小题6】given后面加 by 这是被动式，a lecture given by a professor由教授做的演讲
【小题7】这篇文章是第一人称：they 改成we
【小题8】musical instrument 是可数名词：instrument 改成instruments
【小题9】踢足球，play football，去掉the
【小题10】couldn’t help doing情不自禁地做…,cheer改成cheering