It could have been a law firm; it could have been working in the study group on a homework assignment.
它可能是一家律师事务所；它可能是学习小组做家庭作业。
They could be playing an online game or chatting with their friends while working on their homework.
他们可能边玩网络游戏边与朋友们聊天当做作业的时候。
They are watching the lectures at home as homework, recorded lectures, and when they get to class, they are having more active discussions, or interactions with the teachers or working on projects.
他们把在家观看录制的课程当做作业，来到教室时，他们会进行更活跃的讨论，或者与教师互动或做项目。
They spend all their free time at home working on lesson plans, grading and making homework and tests, and many other things.
他们花了所有在家的业余时间做课程计划、批作业，和其他事情。
They spend all their free time at home working on lesson plans, grading and making homework and tests, and many other things.
他们花了所有在家的业余时间做课程计划、批作业，和其他事情。
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