单项选择题

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

A．twenty-first
B．twenty-second
C．twentieth-one
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单项选择题
About ______ of the students in the college are from foreign countries.
A．two-third
B．two-thirds
C．second-three
单项选择题
The iron ball is too heavy for me ______.
A．to rise
B．to rise it
C．to raise
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