1.The candidate was about to get in the car _____ suddenly a man with a mask appeared and shot at him.
A. while B. after C. as D. when
2. It’s said that non-smokers who are always around smokers have almost the same ______ of suffering from lung cancer.
A. potential B. occasion C. hope D. opportunity
3. _____ to get there before noon, the postman set off in spite of the heavy fog.
A. Promising B. To promise C. Having promised D. Promised
