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

He __________ be at home now because I saw him in the office just now.

The weather turned out to be fine. I       the trouble to carry the umbrella with me.

It was playing video games that took the boy too much time that he          have spent learning．

 --Listen! Marry is singing in the next room. -- It __   ___ be Marry. She has gone home.