He could not watch TV except for two programs a week, could not play with his friends after school until he finished his homework, and had to read two books a week and write book reports about them.
他一周只能看两个电视节目，放学后完成了家庭作业，才能和朋友们一起玩，而且每周必须读两本书，还要写关于这些书的读书报告。
I won't go with you until (till) I finished my homework.
等我做完作业我才和你一起去。
The teen-agers are encouraged to go off and dance and pet with each other, even if they haven't finished their homework; for the grownups need desperately to relax, unobserved.
青少年们也被鼓励去参加，跳舞，玩乐，即使他们还没完成作业；因为成年人们急需放松，不被注视。
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