单项选择题

I don't know ______ he will come tomorrow. ______ he comes, I'll tell you.

A．if; If
B．if; Whether
C．whether; Whether
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Sorry, I took your MP3 by mistake I'll be ______ careful next time.
A．most
B．more
C．much
单项选择题
-- When will the 2008 Olympic Games start-- ______ August 8,2008.
A．At
B．For
C．On
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