.Saving resources is a basic policy of our country . And it proves _____ to its sustainable development .
| A．to be great significance | B．to be of great significant |
| C．of great significance | D．great significant |
______ from what he said, he must be the thief who has stolen the car.
| A．Judging | B．Judged | C．To judge | D．Judge |
They were surprised that a child could work out the problem ______ they themselves couldn’t.
| A．once | B．while | C．then | D．If |
--- I hear Jane has gone to the Holy Island for her holiday.
--- Oh, how nice! Do you know when she ______ ?
| A．was leaving | B．had left | C．has left | D．Left |
The factory was built in a secret place, around _____ were high mountains.
| A．where | B．it | C．that | D．Which |
The teachers were discussing the research project that they would like to see _____ in the coming holiday.
| A．complete | B．completes | C．completing | D．to complete |