__ was once regarded as impossible has come true.

Korean star PSY’s “Gangnam style” video,________,has set the Guinness World Record for the most “liked” video in YouTubehistory.

下列各项中，没有语病的一项是（ ）

Whatever happens, Tom, ________ drugs.

I was completely terrified when I suddenly saw a dark figure leaning ________ the door in front of me.