警方正在调查一起导致一名老年男子住院的恶性袭击事件。

Police are investigating a ___vicious attack that left an elderly man hospitalized.

邻居们警告我们要当心栅栏后面那只凶恶的狗。

Neighbors warned us about the ___vicious dog behind the fence.

检察官将这名嫌疑人描述为一个凶残的罪犯。

The prosecutor described the suspect as a ___vicious criminal.