经过十小时的围困后，持枪歹徒同意释放人质。

After a ten-hour siege the gunman agreed to ___free the hostages.

我们被银行抢劫犯劫持为人质，但警察来了并释放了我们。

We were taken hostage by a bank robber but the police came and ___freed us.

活动家们不知疲倦地工作，以释放被不公正监禁的记者。

The activists worked tirelessly to ___free the unjustly imprisoned journalist.