Translate the following sentence into English.
教室太嘈杂了，老师不得不提高嗓门才能让学生听见他的声音。
【正确答案】：
THE CLASSROOM WAS SO NOISY THAT THE TEACHER HAD TO RAISE HIS VOICE TO MAKE HIMSELF HEARD BY THE STUDENTS.
【题目解析】：
本题考查常见形容词及动词的使用。
嘈杂的：noisy；提高嗓门：raise his voice；让学生听见他的声音：make him(self) heard。
句子结构：教室(如此)嘈杂，(以至于)老师要提高嗓门，才能让学生听见他的声音。可译为so...that引导的结果状语从句。