—Has your father got up?—Sorry, I’m not sure. He __________ got up. Please go and see for yourself.
---Do you know ________? --- I'm not sure. Maybe he is a businessman.
He is a friend ______ can help you in time of need.
The most important thing ______ we should pay attention to is the first thing ______ I have said.
This is the only one of these books that ______worth reading.
The man ______ talked to you just now is my father.