It was ______ his office.
| A．not until the rain stopped did he leave |
| B．not until did the rain stop that he left |
| C．not until the rain stopped when he left |
| D．not until the rain stopped that he left |
Facts prove that the world’s economic development is not a win-lose game but one in which all be winners.
| A．can | B．shall | C．must | D．would |
Everyone here will thank the firefighter for the things they have done to prevent fires______ the environment safer.
| A．make | B．to making | C．to make | D．from making |
______ with so many challenges, Yang Guang, a blind young fellow, didn’t give up; he made great efforts to win success.
| A．Facing | B．To face | C．Faced | D．Face |
— Why do you look so worried?
—My computer broke down and my essay ______ unfinished since.
| A．had left | B．has been left | C．has left | D．was left |
By no means ______ true that all English people know their own language well.
| A．is that | B．that is | C．is it | D．it is |