One of the most critical problems【1】black and other minority Americans today is the difficulty of entering mainstream society without【2】their own racial and ethnic heritage.The process can be an agonizing one，and it sometimes【3】disaster.On June 12，1985，Edmund Perry was shot and killed【4】attempting to rob a plainclothes police officer.Perry was【5】and a resident of Harlem；he was 【6】a graduate of one of the nation's finest high schools and was preparing to enter Stanford University【7】a full scholarship.The Two Worlds of Edmund Perry relates the details of this star student's【8】life and examines the unique pressure of【9】between two radically different social realism.This sense of doubleness experienced by many nonwhite Americans makes it difficult【10】a stable personal identity from outside，the author offers a solution【11】the problem.【12】in the rural south，she learned two languages，one to be used when speaking to family and friends，【13】when speaking to whites.Years later，after enrolling in a writing course at a northern university，she attempted to negotiate a way between her own language and the language of others：I could not—in the process of composing use the language of the old time，yet I couldn't imagine myself in the language.【14】，however，she learned to shape her own experience in her own words.Writing，she suggests，provided a valuable tool【15】elping to establish a balance between her two worlds.

【10】：（）

A.establish
B.establishing
C.established
D.to establish