假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅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）不计分。
I’m tired and covered in dust. I’ve been digging all day and I’ll be doing the same tomorrow. Sound awful, doesn’t it ? But I’ve never had so many fun in my life. As an archaeology student, I have already knew something about the Qin Tomb and the Terracotta Warriors. Most Chinese children can tell you Qin Shihuang was the emperor first joined China together. He was a brilliant ruler, and he was also a cruel man who killed thousands of people. When he became king of the state, he immediate ordered workers to construct an underground tomb for him, which it is said to contain great treasures. But the actual entrance to the tomb has ever been found, nor has the tomb been opened. There are ancient descriptions of crossbows hiding at the tomb’s entrance. It’s said that if everyone steps across the entrance, the crossbows will fire.