Is that girl in red Sally—No, it_______ be her. She has gone to Hong Kong.

Have you heard the latest news?— No, what ________? [ ]

Nathan , studying abroad, was _____ to see his friend off at the airport.

I have been looking for Michael for a wholeday. Where ______ he have gone

We often heard the saying: “Don’t _________ till tomorrow what should be done today.” So you must finish your work today.