past half-century, average incomes _______ quickly indeveloped countries, yet happiness levels have remained almost the same.

At the beginning ofclass, the noise of desks ______ could be heard outside the classroom.

is the population of your hometown—I’m not sure. Maybe five million.

The so-called Asia—Pacific century will make no sense_____ China develops

More and more couples would rather _________ a second baby __________ their first child can feel less lonely.