单项选择题
A．Some students at the back cannot hear the professor. B．The professor has changed his reading assignment. C．Some of the students are not on the professor’s list. D．The professor has brought extra copies of his assignment.
A．save B．preserve C．raise D．retain
A．Move the washing machine to the basement. B．Turn the basement into a workshop. C．Repair the washing machine. D．Finish his assignment.