31．With the cell phone available, I can do whatever I want to do and still______in touch with my parents and friends．
| A．stay | B．to stay | C．staying | D．Stayed |
It is __________ to discuss the question again and again.
| A．worth | B．worthy |
| C．worthwhile | D．worth of while |
__________ it will take me six weeks, I am determined to finish the job.
| A．Even | B．If even |
| C．Even if | D．If |
__________ for one year was a very enjoyable and exciting experience for me.
| A．I go to a British high school |
| B．Going to a British high school |
| C．I have gone to a British high school |
| D．Go to a British high school |
Doris, s success lies in the fact __________ she is cooperative and eager to learn from others.
| A．which | B．that | C．when | D．why |
I recognized him __________ he appeared on the stage.
| A．the moment | B．the moment when |
| C．when the moment | D．at the moment when |