11. ______ person favors thorough and complete reforms in social and political systems.
A) A radical C) A fundamental
B) An advanced D) A radiant
12. It normally takes from five days to one week for a person to adapt to a(n) ______ routine of sleep and wakefulness, sleeping during the day and working at night.
A) irregular C) inverted
B) disorderly D) reversed
13. We have to work even harder though we feel quite ______ our success.
A) secure of C) worried about
B) nervous about D) competent for
14. Shoes are often ______ when they are new.
A) staff C) stiff
B) stuff D) stuffy
15. ______ happenings proved that his plan was better than mine.