6. If no honesty serves as           , our social civilization will descend into savagery. （社会生活的基础）（）

7. Any government that           will not let the country descend into chaos. （代表民意）()

8.                 , not to mention her scientific research.

(她的教学工作非常出色) ()

9. If this is the case with your child, make sure that           . (你要教你的孩子如何有礼貌)    ()

10. Learning tends to tire the learner. If that is the case, the teacher should       .

(尽力避免学生产生疲劳感) ()