冲突威胁要蔓延到邻国。

The conflict ___threatened to spread to neighbouring countries.

然而，当原子弹威胁要将人类从地球上抹去时，这种持续的技术进步变得可疑。

However, this ongoing technological progress became questionable when the atomic bomb ___threatened to wipe humanity off the face of the earth.

经济危机威胁要破坏整个地区的稳定。

The economic crisis ___threatens to destabilise the entire region.