Teenager problems,--is shown in the report,are often connect

填as
as 引导非限制性定语从句,可放在主句之前,或者主句之后,甚至可以切割一个主句；which引导的非限制性定语从句只能放在主句之后.另外,as有“正如……,正像……”的意思
(1)As is known to all,Chinais a developing country.
(2)He is from the south,as we can see from his accent.