My student of biology has---much of my spare time---it has given me a great deal of enjoyment.

occupied, but
我的那些生物课的学生占了我很多业余时间，但是给我带来了很多快乐。

My student of biology has---much of my spare time---it has given me a great deal of enjoyment.
我那生物课的学生占了我很多业余的时间，但是给我带来了很大的快乐。