单项选择题

The moon, being much nearer to the Earth than the Sun, is the ______ cause of the tides．

A．principal
B．basic
C．initial
D．elementary
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Sally was a bit shy, but the teacher found her quite ______ discussing a recent film with others.
A. at home
B. at most
C. at house
D. at heart
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Our association, which has consistently pressed for greater employment opportunities for the disabled, will publish ______ proposals in the near future.
A. their
B. our
C. his
D. its
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