1、使忙于
... drop out 退出,退学,弃权,放弃 employ oneself in 使忙于 get through 接通电话; ; (如考试);花光金钱等,克服,解决问题 ...
2、从事于
... employ oneself in 从事于；忙于 18．approach vt. 走近，靠近 n.[U] 接近 [C]途径，方式，方法 at the approach of 随着……的临近 ...
3、使从事于
... or else否则,要不然 employ oneself in使忙于,使从事于 be out of employment失业 ...
4、忙于
...out of employ 失业employ oneself in 忙于，从事do harm to… 对…有害 ...