单项选择题

During their first teacher training year, the students often visited schools for the ______ of lessons.

A．observation
B．investigation
C．inspection
D．examination
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单项选择题
Belgium replied that she had always been faithful to her international ______.
A．obligations
B．duties
C．responsibilities
D．liabilities
单项选择题
Over the last fifteen years, running has become a popular ______ for 30 million participants of all ages.
A．fantasy
B．pastime
C．symposium
D．penalty
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