He ran off____ I could stop him

Don’tbring food to the party. If you do, the teacher will ________ .

Do you know when the Chinese custom_________ from?–It’s hard to say. But its characteristics__________ the Tang Period.

“We_____ the train had we left earlier,” the wife complained to the husband.

Peter told us the work would be finished by next month, ________ personally I doubt very much.