flunk|flunked|flunking

老师不得不让这个学生不及格，因为她第一次考试没通过。

The teacher had to ___flunk the student because she failed the first exam.

他在数学考试中挂科了。

He ___flunked his math exam.

如果他继续缺课，很可能会挂掉这门课。

If he keeps skipping classes, he's at risk of ___flunking this course.