28. (A) The role of travel agents. (C) The number of last-minute bookings. (B) The way people travel. (D) The prices of polar expeditions.

3. What is the risk facing America? (A) Its schools will be overwhelmed by the growing number of illegal immigrants. (B) The rising generation will be less well educated than the previous one. (C) More poor and non-white students will be denied access to college. (D) It is going to lose its competitive edge in higher education.