What do you think of teacher ,Bob?—I find it fun and challen

What do you think of teacher ,Bob?—I find it fun and challenging.It is a job ___ you are doin
—What do you think of teacher ,Bob?
—I find it fun and challenging.It is a job ___ you are doing something serious but interesting .
A where B that
可是我觉得A也可以啊 可以做同位语啊 that的后面做job的同位语.