单项选择题

Mr. Morgan can be very sad ______ , though in public he is extremely cheerful.

A．by himself
B．in person
C．in private
D．as individual
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______ it or no, his discovery has created a stir in scientific circles.
A．Believe
B．To believe
C．Believing
D．Believed
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Please be careful when you are drinking coffee in case you ______ the new carpet.
A．crash
B．pollute
C．spot
D．stain
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