一个令人害怕的想法突然出现在我脑海中。

A ___frightening thought suddenly occurred to me.

我们上周末看了一部令人害怕的电影。

We watched a ___frightening movie last weekend.

我避免看令人害怕的电影，因为它们会让我做噩梦。

I avoid ___frightening films because they give me nightmares.