Would you mind _____ the room?A. clean B. cleaning C. to clean
---Can I help you? --- I want to buy something _______ presents _______my mother.
The boy on the playground ____ be Tom, because he saw him in the library just now.
--- Can I see the headmaster at the moment, please? --- I'm afraid not. He _______out. He _______ in 10 minutes.
We spend as much time as we can _______ English.
When did your father _______ your mother?