单项选择题 AIDS is a global problem that demands a unified, worldwide solution, which is not only the responsibility of nations in which AIDS is most ______.

单项选择题 Psychologists suggest that children who are shy are more ______ to develop depression and anxiety later in life.

单项选择题 The parents of Lindsay, 13, an ______ tennis player who spends eight hours a day on the court, admit that a regular school is not an option for their daughter.