I have little doubt theplan will succeed.

As we all know, diligence is the path ________to happiness. ( )

依次填入下列各句横线处的成语，最恰当的一组是①降低未成年人犯罪率，学校 ，既要用制度规范，更要加强德育教育。②教育事业关系到国家的前途和命运，教书育人是人民教师 的天职。③在校运会上，班里的体育特长生 地承担起了军体拳表演任务。

The boys volunteer three hours ___________ up the park near their school.

My sister failed the driving test and isin low spirits．—I’m sorry for her．—____．