Mary ______ my letter; otherwise she would have replied before now. 

---Have you got the final result?---Yes, very disappointing. We________ have won the game.

—Whose schoolbag is this?—It ___________ be Mary’s. It has her name on it.

--- Will you take up teaching as a career after graduation? --- Hard to say. I _______ go abroad for higher education instead.

Last night Li Ping watched the football match at my home, so he________ in his office.