There a great concert in the theater next Saturday evening.
He said that he had met her two years _______.
She said she would return the dictionary to me ________.
The police ____ still not sure ______ the young man killed himself or was killed.
You had better ________some food and drinks before the field trip ________.
—How many students do you think are still on the playground now?—I am afraid there are few of them, ______?