He had been in hiding...
Fearing the authorities...现在分词引导原因状语
in hiding = in concealment
he remained in hiding at home...
the only other people who knew the secret 仅知道的人
the only other people who finished the work 仅完成这项工作的人
they thought it their duty to...
I thought it very difficult to pass this examination.
We all think it our duty to support our parents.
quite unaware of the fact that...
We amass requisites quite unaware of the fact.
his brothers found it impossible to do...
It is quite impossible to finish the hard work in 2 hours.
I found it quite impossible to finish the hard work in 2 hours.