我看到有人在灌木丛后鬼鬼祟祟地躲着。

I saw someone ___skulking behind the bushes.

那个学生因为没完成作业，整天在教室里鬼鬼祟祟地躲着老师。

The student spent the whole day ___skulking in the classroom to avoid the teacher after failing to finish his homework.