81. Milk is indispensable _____ the health of a motherless baby.
A. to
B. at
C. with
D. on
82. Modern industry abounds _____ opportunities for young men with imagination.
A. for
B. on
C. in
D. of
83. More than one third of the Chinese in the United States live in California, ______ in San Francisco.
A. previously
B. predominantly
C. practically
D. permanently
84. More than two hundred years ago the United States _____ from the British Empire and became an independent country.
A. got off
B. pulled down
C. broke away
D. dropped off
85. Most good writers use every means _____ to make the reader's way smooth and easy.
A. at their disposal
B. at their request
C. at their will
D. at their convenience
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