442.should learn more about the inner world of youngsters, try to understand them, and guide them to acquire a sense of self-worth.

　　443.Whether sth is the best measure for handing any problem caused by children is up to the parents to decide—not the schools.

　　444.malnutrition

　　445.disturb the natural balance

　　446.a powerful corrective

　　447.Don’t forget to flush . 便后要冲水

　　448.dyed yellow hair

　　449.It is not absolute that an intelligent couple will have a clever child.

　　450.a more environmentally friendly place to live

　　451.the dangerous gas given off by exhausts of cars , bus and lorries

　　452.plain looking face 平凡的长相