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a
joe and helen mills had two small children. one was six and the other four. they always resisted going to bed, and helen was always complaining (抱怨) about this and asking joe for help. but as he did not come home until after they had gone to bed during the week, he was unable to help except at weekends.
    joe considered himself a good singer, but really his voice was not at all musical. however, he decided that, if he sang to the children when they went to bed, it would help them to relax, and they would soon go to sleep.
    he did this every saturday and sunday night until he heard his small son whispered to his younger sister, "if you pretend that you're asleep, he stops."
1. the children always resisted going to bed, which ___________.
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