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Work hard your dream will come true .
A．but B．and C．or D．so
Which is smaller, the sun _____________the moon?
A．so
B．but
C．or
D．and
Bill can swim, _______ he can’t sing.
A．but
B．and
D．so
Don’t talk _____ drink in class.
The hospital is new _____ very dirty.
A．and B．or C．so D．but