"I feel like I am walking a ....... right now. I am working full-time and going to school full-time and I am always on the*^*brink of getting fired for being too tired or taking too much time off for exams. At school, I am always on the brink of*^*getting kicked out for getting poor grades. I don't have time, with work and school, to devote to studying enough to*^*get good grades," Ellis said to Robert.
A.tightrope
B.fine line
C.obstacle course
D.mind game
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