—Do you still remember when we went to Nanjing?—I can't remember now but ________ sometime last summer?
“My boy, do remember to leave things _____ you can find them again.
I found my new school quite different from _____ I had studied in before.
—You don’t seem to be quite yourself today. What’s wrong? —Oh, I’m suffering from a cold. Nothing serious, _____.
Our school, _____ in 1943, will celebrate its 70th anniversary this year.
It was not until 1978_____ set free from the prison.