单项选择题

A．schoolwork
B．exercise
C．teamwork
D．research
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单项选择题
Where did one of the runners fall down
A．50 meters from the end.
B．15 meters from the end.
C．10 meters from the end.
D．5 meters from the end.
单项选择题
A．promiseB．introduceC．encourageD．require
A．promise
B．introduce
C．encourage
D．require
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