单项选择题

The factory produces half a million pairs of shoes every year, 80% () are sold abroad.

A. of which
B. which of
C.of them
D.of that

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The Parkers bought a new house but () will need a lot of work before they can move in.

A. they
B. it
C. one
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I keep medicines on the top shelf, out of the children's().

A. reach
B. hand
C. hold
D. place

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