11.  In the past, most foresters have been men, but today, the number of women ____ this field is climbing.  

A.  engaging        B. devoting             C. registering        D. pursuing  

12.  When confronted with such questions, my mind goes ____, and I can hardly remember my own date of birth.

A.     dim            B. blank                C. faint             D. vain

13. Evidently, there has been a ____ towards simpler style in women's dresses.  

A.  fashion         B. intend               C. tendency           D. trend     

14. Some of the most important concepts in physics _____ their success to these mathematical systems.  

A. oblige          B. owe                  C. contribute            D. attribute  

15. As your  instructor advised, you ought to spend your time on something __ researching into.  

A.  precious        B. worth               C. worthy             D. valuable  

16. As we know, the satellite moves in the ____ space.  

A. external         B. outward             C. outside            D. outer 

17.    One reason for the successes of Asian immigrants in the U. S. is that they have taken great ____ to educate their children.  

A.     efforts         B. pains             C. attempts          D. diligence  

18. If any man here does not agree with me, he should ____ his own plan for improving the living conditions of these people.  

A.     put on          B. put out              C. put in            D. put forward  

19. The meeting was ____ when the president fell ill.  

A.  put down       B. cut short            C. fall down            D. shut out  

20.    Your improper words will give ____ to doubts concerning your true intentions