单项选择题

A．When they are on holidays.
B．On Sunday mornings.
C．On Saturday night.
D．As soon as they have information.
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单项选择题
A．To demonstrate an experiment.B．To explain the grading procedures.C．To inform the students of the safety measures.D．To tell the students how to use the safety equipment.
A．To demonstrate an experiment.
B．To explain the grading procedures.
C．To inform the students of the safety measures.
D．To tell the students how to use the safety equipment.
单项选择题
A．They complete all their assignments.B．They study hard for his tests.C．They compete for the best seats in the class.D．They read all his books.
A．They complete all their assignments.
B．They study hard for his tests.
C．They compete for the best seats in the class.
D．They read all his books.
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