I can’t understand the story correctly ______ the new words in it.[ ]

Attention, please. The plane has to be _________ because of the foggy weather.— Oh, bad luck! We have to wait now.

The possibility _________ we won’t produce enough goods troubles everyone here.

He’s already left here. You ____ have come here half an hour earlier.

Hearing the news, I was excited say a word.[ ]