Make one more effort and you are sure to work out the maths problem.
We have to rely on【 the】 government to find out who(不能用whom,这里要做主语） is responsible for this serious accident.
or
We have to rely on【 the】 government to find out who is to blame for this serious accident.
Finally/In the end/At last,all the bad【 guys】 in the film were brought into justice.
祝你开心如意!