without the polce's help,it,found,the girl,very difficult they,to find,called Wei Fang
(他们发现没有警察的帮助要想找到这个名叫书芳的女孩是非常困难的).
belongs to,hardworking,in the end,students,success (连词成句)
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their future,learn,teenagers,by themselves,to plan,should(连词成句)
many ways, for us,are, to keep in touch, there(连词成句).