.He walked down the hills, _______ softly to himself.
| A．sing | B．singing | C．sung | D．to sing |
I haven’t read ____ of his books, but judging from the one I have read I think he’s a very promising writer.
| A．any | B．none | C．both | D．either |
——Why are the tax collectors so busy?
——Many people prefer to have their tax forms completed by a professional rather than ___.
| A．do it themselves | B．doing it themselves |
| C．to do it themselves | D．done by themselves |
——Please call me at 8:00 tomorrow morning. I’m kind of forgetful.
——Don’t worry about that, you’ll be surely ____.
| A．reminded | B．told | C．warned | D．informed |
He ____ writing the paper now. He hadn’t written a single word when I left him ten minutes ago.
| A．shouldn’t be | B．can’t have finished | C．can’t be | D．mustn’t have finished |
——Watch!
——I ____ but ____ I ____ anything unusual.
| A．watched; have watched | B．have watched; am not seeing |
| C．was watching; wasn’t seeing | D．am watching; don’t see |