— He ought to have been warned of the danger.— ______, but he just wouldn’t listen to me.
We _____ on this project for four hours. Let’s have a rest.
Would it be ______ for you to pick me up at four o’clock and take me to the airport?
I would rather you did some reading while you are free, but you ______.
I don’t think ___ possible to travel around the world without any modern equipment.
I have a ______ to talk too much when I’m nervous.