49. We ____ Edison’s success to his intelligence and hard work. A. subject B. attribute C. owe D)refer ...

44. The point in ____ by correspondence is not whether we should do it but whether we can do it. A. argument B. debate C. dispute D. controversy ...

38. They are sure they have all the facts they need to ____ the existence of a black hole. A. obtain B. maintain C. verify D. display ...

34. The leader of the expedition ____ everyone to follow his example. A. promoted B. reinforced C. sparked D. inspired ...

30. Iron supplements may produce a feeling of wanting to ____ , and may be poisonous in some cases. A. throw away B. throw up C. throw in D. throw out ...

25. Women do not usually eat the recommended daily ____ of iron. A. section B. allowance C. share D. part ...

21. An employee told the government official that “US” is short ____ “Uncle Sam”. A. for B. to C. with D. on ...

17. Over the last fifteen years, running has become a popular ____ for 30 million participants of the ages. A. fantasy B. pastime C. symposium D. penalty ...

12. People appreciate ____ with him because he has a good sense of humor. A. to work B. to have worked C. working D. having worked ...

6. On weekend my grandpa usually ____ a glass of wine. A. subscribes B. engages in C. hangs on D. indulges in ...