单项选择题

It is about ______ walk from here to the office.

A．half an hour's
B．half a hour's
C．half an hours'
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______ police caught ______ thief in the shop.
A．A; a
B．A; the
C．The; a
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______ Chinese in your English class.
A．Not speak
B．Don't speak
C．Speak not
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