Gun control is a subject Americans have argued for a long time.
| A．of which | B．with which |
| C．about which | D．into which |
.——What do you think of ________ lecture given by Professor Thomas?
——Great. I quite agree to his idea that every one can make ______ difference to society.
| A．the, a | B．a, a | C．the, the | D．a, the |
— I hope you won’t mind my pointing out your mistake.
— _______.
| A．Of course | B．Yes, I don’t | C．You’re welcome | D．Certainly not |
— Has he finished his report yet?
— I’m not sure. He _______ the report these days.
| A．has been writing | B．is writing | C．wrote | D．has written |
— When will the new bridge be completed?
— It is said that it _______ by the end of this year.
| A．will be completed | B．will have been completed | C．is completed | D．will be completing |
_____ in prison for ten years, he seems to be unaware of what has happened outside.
| A．Having kept | B．Having been kept | C．Kept | D．Keeping |