单项选择题
A. By finding out how to get rid of it. B. By exercising vigorously. C. By getting more of it. D. By getting the right amount of it.
A. At 6:30. B. At 8:00. C. At 5:30. D. At 6:00.
A. Mark the latest homework assignment. B. Tell the students the class is cancelled. C. Make an appointment with a doctor. D. Return some papers to his students.