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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