________back at my middle school years,I regret not having worked so hard as I should have.
My cousin doesn’t know what to ______ at the university; he can’t make up his mind about his future.
—You should have thanked the hostess before leaving. —I meant ______. But I couldn’t find her when I was leaving.
The girl looked at me with a ____expression. Maybe the problem was quite ______.
I sincerely regret that I have hurt your feelings, but I didn’t do it ______.
It is a common practice in the USA that one needs to make a(n) ___ before seeing a doctor.