The students spend an hour taking part in all kinds of after class activities.
或： It takes the students an hour to take part in all kinds of after class activites.
祝你学习进步，更上一层楼！ (*^__^*)
不明白的再问哟，请及时采纳，多谢！
The students take part in the acitivities after school for one hour every day.
The students spend one/ an hour taking part in the after-school activities every day.
祝学习愉快！
The students spends an hour in taking part in various extra-curricular activities everyday.
Students spend an hour each day taking part in different activities.
The students spend one hour per day to participate in various extracurricular activities
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