The only existing problem is ____ we can find this special wood in the forest in such a short time.
| A．when | B．where | C．that | D．whether |
The manager’s son, _____ is Bob, gave me a sweet smile.
| A．his name | B．he name of whom | C．of whom the name | D．of whom name |
In spite of her spoken French, she can make herself _____ by gesture.
| A．understand | B．understanding | C．to understand | D．understood |
As we all know, the beautiful mobile isn’t _____ high price at all.
| A．worthy too | B．worth that | C．fit much | D．valuable that |
_____ environmental damage is done does it take many years for the ecosystem to recover.
| A．Even if | B．While | C．Only if | D．Once |
The student’s mind is always _____ when he listens to his teacher.
| A．wondering | B．wandering | C．wondered | D．wandered |