根据短文内容及首字母提示，填写所缺单词。
Many people in Beijing have returned to school only because they have become parents. Parents are
searching for help to solve a problem: the education of their "only c 1 ". One student complained
about his father, who liked smoking, always left the s 2 of smoke in the room and he could not do
his homework there. Another wrote that his father often played Majiang and the n 3 kept him awake
most of the night. Many parents know l 4 about home education and keep making mistakes. "Parents'
schools are badly n 5 .'' an official (官员) said.
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