Water, _______enough, can change into vapour quickly.
| A．when heated | B．heating | C．though to be heated | D．when is heated |
— 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 |
— Did your father catch the train?
— No. The train _______ before we got to the railway station.
| A．had left | B．was leaving | C．would leave | D．left |
The old man _______ three large houses and a factory before he died. He was quite wealthy.
| A．possessed | B．concluded | C．contained | D．maintained |