11. At that time, we did not fully grasp the significance of what had happened.
A. give
B. attach
C. lose
D. understand
12. Anderson left the table, remarking that he had some work to do.
A. doubting
B. saying
C. thinking
D. knowing
13. He asserted that nuclear power was a safe and non-polluting energy source.
A. maintained
B. recommended
C. considered
D. acknowledged
14. The study also notes a steady decline in the number of college students taking science courses.
A. relative
B. general
C. continuous
D. sharp
15. She always finds fault with everything.
A. criticizes
B. simplifies
C. evaluates
D. examines
