Paragraph Ten . If you sit at a

Paragraph Ten . If you sit at a desk all day, get up frequently and walk around. If you carry aheavy shoulder bag, make sure to carry it on both your right and left shoulder,switching off as each gets tired. Even better: wear a cross-body bag. These andother tips will help you avoid bad posture. 45. Tips for m_________good posture.
【正确答案】：maintaining
【题目解析】：本段介绍了避免不良姿势的一些建议。久坐的人要经常起身走动。肩背重包时要换着肩膀背。最好背斜挎包。可见这些都是保持正确姿势的建议，因此空格处应该填写意为“保持”且以“m”开头的词，只有maintain合适。考虑到for是一个介词，其后的要用动名词，所以正确答案是maintaining.