1. Drivers who use mobile phones on______ road are more likely to have _____ accidents, a science report said recently.
A. a; the B. /; / C. the; / D. /; the
2. ______ several times, but he still doesn’t know how to do it properly.
A. Being shown B. Having shown
C. Having been shown D. I’ve shown him
3. She went out angrily _____ I realized what was happening.
A. while B. after C. when D. before
