--- You haven’t lost the ticket, have you? --- _________. I know it is not easy to get another one now.
Can you make sure _______ the gold ring?
It’s no good ________about his grades.
If he ________tomorrow, I could talk to him about it.
Ann is said ________ research in Africa, and she will come back next month.
The old man lived in a house, in front of which _____ with a history of 100 years.