21. Although some societies are __undeveloped, their languages, from a linguist’s point of view, are very complex.
          A. technology               B. technologically      C. technological          D. technologist
22. The ________ was a success; the patient will fully recover in a month’s time.
         A. operate                     B. operation                C. operator           D. operating
23. I like my work because I have the ________ to make my own decision.
         A. freed                         B. freedom                  C. freely           D. free
24. That teacher is a(n) _______ one. His pupils like his sense of humor.
          A. amusing                    B. amused                   C. amusement           D. self-amused
25. The road has just been ______ for better flows of traffic.
         A. width                        B. wide                        C. widely           D. widened
26. She wants to look ______ in her wedding reception.
          A. natural                      B. naturally                 C. nature           D. natured
27. Scientific progress supplies us with ______ such as washing machines, tractors,….
          A. convenient               B. conveniences          C. inconvenience           D. inconveniences
28. He was _________ in his final attempt. What a pity for him!
          A. successful                 B. successive              C. unsuccessful           D. success
29. You have to wear special clothes to work in the lab for the ________ of yourself.
          A. protective                 B. protector                 C. protection           D. protectiveness
30. There are many interesting _________ events included in this book.
          A. historical                  B. historically             C. historian           D. history
31. The ________ will judge you on your quality and performance.
          A. examining                B. examinees              C. examiners           D. examination
32. Some animals are now ____________. We need to find ways to protect them.
          A. dangerous                 B. dangerously            C. in danger           D. danger                   
33. People who are out of work are ____________.
          A. unemployed             B. unemployment       C. employed           D. employee
34. The old man has saved a lot of money for his _____________.
          A. retire                         B. retiring                   C. retirement           D. retired
35. We had a _________  discussion about football.
          A. bore                          B. boring                     C. bored           D. boredom
36. She gave a long ___________ about unemployment in Vietnam.
          A. lecturer                     B. lecturing                 C. lectured           D. lecture
37. Money doesn't always bring ____________.
           A. happy                       B. happily                   C. happiest           D. happiness
38. His _________ makes his parents happy.
          A. success                     B. successful               C. succeed           D. succeeded
39. Mary and her younger sister have many __________.         
          A. different                   B. difference               C. differ           D. differences.
40. The weather this month______ him because it has been raining most of the time.
          A. disappoints               B. disappointing         C. disappointed           D. disappointment
41. This job is______ and a lot of young people like it.
          A. attraction                  B. attracted                 C. attract           D. attractive
42. This shirt is good and its price is______
          A. reason                       B. reasonable              C. reasonably           D. reasoning
43. Bill is a good driver. He usually drives………………..         
          A. carefully                   B. carelessly               C. careful           D. careless
44. She is a very famous stamp________ in England.
          A. collection                 B. collective               C. collector           D. collect
45. Now we are still looking for the ________ to the problem of traffic accidents.
            A. solve                       B. solver                      C. solution                  D. solvable
help meeeee