A. question
B. notion
C. exception
D. vocation

A．question
B．notion
C．exception
D．vocation

A．election
B．pronunciation
C．question
D．operation

A:liberation B:relation C:question D:attention

A:nation B:pollution C:motion D:question

A:election B:pronunciation C:question D:operation

A:education B:station C:attention D:suggestion

A:question B:notion C:exception D:vocation

A:nation B:pollution C:motion D:question