both, all, each, every I don"t know which book is the better one; I shall read ______.
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either, neither, no one, none I wrote to John and Henry, but ______ of them has replied.
______ of March is my sister"s birthday.
A. The twenty-one
B. Twenty-one
C. The twenty-first
D. Twenty-first
在上下颌切牙中，牙根圆且直，可以使用旋转力拔牙的牙齿是
A. 上颌侧切牙
B. 下颌侧切牙
C. 上颌中切牙
D. 下颌中切牙
E. 上、下颌中切牙
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