—He may be in the classroom, I think.—No, he _______ be in the classroom. I saw him go home a minute ago.
He used to ____late, but now he is getting used to _______early.
—Malaysia Airlines Flight MH370 was expected to land in Beijing the morning of 2014,March 8.
____ old man behind Mary is _____ university teacher.
If I _______ you, I would give some flowers to her.
_______ used to _______ a post office near my house.