在与绑匪谈判后，警察释放了人质。

The police ___freed the hostages after negotiating with the kidnappers.

当新证据证明他们的清白时，这些无辜的囚犯终于被释放了。

The innocent prisoners were finally ___freed when new evidence proved their innocence.

这个人道主义组织不懈努力，以释放政治犯。

The humanitarian organization worked tirelessly to ___free the political prisoners.