恐怖分子在市中心制造了爆炸事件，造成多人伤亡。

The ___terrorists set off a bomb in the city center, causing many casualties.

恐怖分子炸毁了市中心的一座大楼。

The ___terrorists bombed a building in the city center.

政府加强了机场安检以防止恐怖分子发动袭击。

The government tightened airport security to prevent ___terrorists from launching attacks.