Could you ___ this 10-dollar bill so I can make a phone call?
In crowded places like airports and railway stations, you __________ take care of your luggage.
The teacher __________ have thought Johnson was worth it or she wouldn’t have wasted time on him, I suppose.
The weather turned out to be fine yesterday. I __________ the trouble to carry my umbrella with me.
You know he is not going to let us leave early if we __________ get the work done.
—Is Jack on duty today?—It __________ be him. It’s his turn tomorrow.