Recently a really strange thing happened in a middle school in China's Hubei Province. Over 600 students at the school took part in a "caring for an egg like a baby"____(active). in which they were asked to keep an egg close at hand for a month____breaking it.

    "It's hard for parents to bring up their children____many students just ignore it, " said Liu Kang, the school's director. "They should____(teach) to be grateful to their parents,who have given them life but ask for nothing in return ."

    Li Ming is one of the students. His egg didn't break during the month, but he felt____(exhaust). "I now understand what great difficulty my parents have had____（bring）me up. I'll do all I can to make their life easier and____(comfort) when I grow up,”promised the 13-year-old boy.

    ____(luck), about 450 students broke their eggs. Yan Yueming broke his egg after just five days, which made him frustrated. He said,”I can't imagine ____sad my parents would be if there was something wrong with me, their ‘egg'! It is now time I did something____return for their love,”said Yan.

若a^m=3，aⁿ=2，则a^m+n=​____。