fill up to grade

例句：

1. 1.The teacher filled the classroom with laughter and chatter.
   老师让教室充满了笑声和谈话声。
2. 2.The box was filled with books and papers.
   盒子里装满了书和文件。
3. 3. The student filled up the time by studying for hours every day.
   学生通过每天学习几小时来填满时间。