---I think Miss Lin must be in the library. She said she would go there.---No, she __________be there. I have just been there.

-　Look,　Sue　is　over　there.-　That　____　be　her.　She　is　in　Canada　now.

Tom hasn’t come to work since last Friday.       he have had an accident?

—Did Ann fail in English?—She ____. Don't you notice that she looks depressed?

 When Marx was in London, he  __   read at the library for hours.