50. The change in smoking habits () a change in the incidence of lung cancer. The more people smoke, the more chances of occurrence for lung cancer.

39. The “discipline” message asks people to save, while the“enjoy yourself” message asks people to spend; therefore, they () each other.

38. She authorized her partner to carry out the daily responsibilities () when she was on her business trip.

37. When the police caught up with him, Mr. Foster had to () that he’d broken the speed limit.

36. As the result of her divorce, she was obviously () the double burden of playing the role of both mother and father.

35. This symbol of Chinese () for 5,000 years implies the national spiritof courage and determination.

34. His efficiency in doing things is a sign of being () to solve aproblem or fulfill a job successfully with speed.

33. Upon seeing the surprise gift, she couldn’t help but (), “This is themost beautiful necklace I’ve ever seen!”

32.For those suffering from fatigue and poor performance, it is() to eat red meat since it contains rich iron.

31. He expressed his thankfulness to the school for giving his son an opportunityto ()( his dream.

30. Though some employees ()( the new rule by the company, most ofthem are in favor of it and think it’s beneficial to them.