The teacher reported to the headmaster how the class meeting ________ the day before

It’s good to see you again.—Yes. I keep all the letters __________ you wrote to me over the years.

You look so tired. You _____have stayed up late again. [ ]

I don’t suppose anyone will volunteer, ________?[ ]

Smoking is not allowed in our school, so it may be a good chance for our math teacher to_______ smoking.