It was shameful to be found sleeping in class. His classmates’ laughter only_____ his embarrassment.

Someone is knocking at the door. It my sister. It’s time for her to be back.

I was at the cinema at 9 o’clock last night. What about you? — I _____ at home.

. ____ to speak when the audience interrupted him.

I think the man over there must be Bob.—It ______ be him. He has gone to Paris.