单项选择题
As a rule, the workers are paid（）
A．at the hour B．by the hour C．for an hour D．in an hour
单项选择题 Please don't run（）fast.
单项选择题 He told me that（）nothing there was worth looking into.
单项选择题 "You are not a new member, are you""（）. I joined only yesterday."
