单项选择题
A．They shared mutual friends in school. B．They had known each other since childhood. C．They shared many extracurricular activities. D．They had many interests in common.
A．ensuring no child is left behind B．increasing economic efficiency C．improving students’ performance on SAT D．providing good education for baby boomers
A．Trying to sketch a map. B．Discussing a house plan. C．Painting the dining room. D．Cleaning the kitchen.