单项选择题

Most of the retired people are happy（）their quiet life in the country-side.

A. to
B. of
C. with
D. on

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The conference（）in Beijing next week is bound to be a great success.

A. holding
B. being held
C. to hold
D. to be held
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For years, doctors（）millions of patients’ lives with the help of microscopes.

A. have saved
B. are saving
C. will save
D. were saving
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