3. White people’s officially privileged status waned over the latter half of the 20th century with the demise of discriminatory practices in, say, university admissions. But rising wages, an expanding social safety net and new educational opportunities helped offset that. Most white adults were wealthier and more successful than their parents, and confident that their children would do better still.
5. adv. 最初，开头
6. A fourth terminal has just been completed and is due to open in the second half of 2017.