31.

4. Race remains a prominent and ______ issue in the United States, which has struggled to overcome a legacy of slavery and discrimination.

49. Which of the following is true about the research under discussion?

46. What does the Indiana University study show?

17. —Why do you choose to work with special needs children?   —I think it will add a new _____ to my life.

10. Don’t let such a ______ matter as this come between us so that we can concentrate on the major issue.

38.

50. The 13 measures of psychological well-being are used to _______。

11. ________ on the cyberspace issue in a speech at a welcoming dinner in Seattle, Xi Jinping called on all countries to cooperate and draw up Internet policies corresponding with their national conditions.

19. So large is the Pacific, _____ 30% of the earth’s surface, that the energy generated by its warming is enough to touch off a series of weather changes.

43. According to this passage, the sea _____ is likely to have the lowest salinity.

6. —Poor and backward area ________ Western China is, many college students are willing to work there after graduation.   —I can’t agree more. More chances of employment are available.