audit|audited|auditing

他对经济学感兴趣，所以决定旁听这门课。

He decided to ___audit the economics class because of his interest in the subject.

为了备考研究生考试，他旁听了经济学课程。

To prepare for the graduate exam, he ___audited the economics course.

会计部门正在审计公司的财务记录。

The accounting department is ___auditing the company's financial records.