1. His employers could not complain about his work because he was ______ in the performance of his duties. 

 

<employer>

employer 雇主，老板

employee 雇员

</employer>

 

<assiduous>

assiduous 勤奋的

insidious 阴险的，狡诈的

</assiduous>

 

<derelict>

derelict 遗弃物

relics 遗骨

relict 残余物

</derelict>

 

<penetrate>

penetrate 穿透

permeate 渗透

diffuse 弥漫

diversify 使不同