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

58. I just want to tell you that only () and determination can give you the power to achieve success.

57. Class discussions next week will () the importance of love, communication and a close relationship between parents and their children.

56. Instead of ignoring or envying successful students, I made it my mission to () the mysterious causes of their success and greatness.

55. It is very important for students to understand and () new information. Besides, they should examine and judge information carefully and then make the right decisions.

54. The organization has been working with local authorities as well as regional government and officials to () the problem of climate change.

53. The parents were quite happy to () our suggestion because it had taken their most important concerns into consideration.

52. Dogs cannot distinguish the color of traffic lights, so the master must make the decision of when it is safe to () across the road.

51. An allowance can be () your child’s age, your own financial resources,the expenses it will cover and the goals you and your child wish to accomplish.

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.