单项选择题

By the end of the ______ century(世纪，百年) ,computers may be seen in every home.

A．twenty-first
B．twenty-oneth
C．twentieth-one
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单项选择题
A computer is ______ useful(有用的) and wonderful(极好的，惊人的) machine,
A．an
B．a
C．the
单项选择题
Because he was late again for school ,his teacher got ______.
A．much angry
B．very angrily(生气地)
C．very angry
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