Why didn’t you go to the movie yesterday? —Because I_________it before.

The question is so hard. None of them can answer it _________.

Why not _the party till tomorrow? We have an exam today. –No problem. See you then.

Would your sister go to Hainan this summer?— If I don’t go, ______. [ ]

Fortunately, the illness is fully treatable if _____ within ten days.