用给出的单词填空

steeped     wonk     entrench     extend     nook     

Barack Obama is determined to 1.____ health insurance to nearly every Americans. His health tsar, Tom Daschle, is 2.____ in the subject. He understands how politically hard it will be to advocate much more government involvement in health care. Fortunately, he is surrounded by able 3.____, and he has Mr Obama’s ear. Public opinion is in his favor, at least for now. But every 4.____ of America’s insanely complex health-care system has 5.____ defenders, and every previous attempt to provide universal health care has failed.

词汇详解：

extend 延长，延续
steep 浸，泡
wonk 书呆子
nook 隐蔽处
entrench 牢固地确立

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