单项选择题

______his address, I can' t send this book to him.

A．Not knowing
B．Knowing
C．Not know
D．Not known
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单项选择题
--______may I______ the book -- For three weeks.
A．How often; borrow
B．How often; keep
C．How long; borrow
D．How long; keep
单项选择题
-- There is a bad smell hem.-- Oh, dear ! I______ the gas.
A．must forget turning off
B．must forget to turn off
C．must have forgotten turning off
D．must have forgotten to turn off
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