恐怖分子将他扣为人质长达18个月。

The terrorists ___held him hostage for 18 months.

我被关在一个小小的阁楼房间里。

I was ___held prisoner in a tiny attic room.

世界各地动物在动物园里被当作囚犯关押。

All around the world animals are ___held as prisoners in zoos.