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

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.

49. One day they passed more than 20 villages (), and some of these are said to have stretched for six miles or more.

48. Not until recently have we realized that the increasing world population may lead to a potential gloomy () for humanity: starvation.

47. A few years later, Franklin got married, started his own printing shop, and was () a successful young businessman.

46. In short, participation in sports is extremely () for college students not only physically but also emotionally and socially.

45. A research proposal is intended to convince others that you have the () and the work plan to complete it.

44. The little boy () the cartoon and he didn’t hear the doorbell ringing at all.

43. Upon hearing the news about his mysterious neighbor, he uttered an () of surprise.

42. Though he was 80 years old, blind and hardly able to walk, his family () him so much that they could hardly bear the thought of his death.

41. When employees participated in the problem-solving process, they were much more willing to () solutions to the problems.