我有种被人注视的感觉，尽管房间里空无一人。

I had the ___sensation that I was being watched, even though the room was empty.

我突然有种感觉，觉得哪里不对劲。

Suddenly I had the ___sensation that something was wrong.

当她踏上索桥时，一种奇怪的坠落感向她袭来。

As she stepped onto the rope bridge, a strange ___sensation of falling overcame her.