The importance of these varies according to the nature of on

不应该再加谓语动词are,那样会多一个动词.

The (importance) (单数主语) of these varies (动词) according to the nature of one's job and one's life-style

The lusheng dance varies according to nationality.
同是芦笙舞,因民族之不同,

The price varies according to the quality.
质量不一样,价格也就不同.

Charge varies according to material and condition of garments.
收费视衣物的质地与情形而定编.

The charges varies according to the types of call you make.
费用根据您打电话的种类不同而有差别.

The punishment varies according to the degree of the foul.
犯规的程度不同,处罚就有所不同.

The insurance rate for such kink of risk will vary according to the kind. 
这类险别的保险费率将根据货物种类而定.

Punishment varies according to the gravity of the offence.
处罚根据罪行的严重程度而有所不同.