课堂上老师的解释引起了很多困惑。

The teacher's explanation caused much ___confusion in the class.

办公室里文件堆得到处都是，一片混乱，很难找到重要文件。

The ___confusion of papers all over the office made it difficult to find the important document.

面对这么多选项，他感到一阵困惑。

Faced with so many choices, he felt a wave of ___confusion.