若（x²+y²）²﹣3（x²+y²）﹣10=0，则x²+y²=____ .

完形填空

    Bosh is a worker．He 1  very poor．He lives in a dirty small room and2about food. His friends are 3  too．One night the wind is hard and 4  is snowing heavily. Bosh5to bed early but he can't fall asleep(入睡)．He doesn't have 6 for supper. He  7 a man get in through a broken window．The man8to search the bookshelf. Bosh gets up，says to the man, “Don't waste time．I can't  9 any money in the daytime. How can you find any at10 ?”

新中国成立后，中国人民从此过上了幸福安宁的生活。为什么在第一届中国人民政治协商会议上还要将曾经激发中华民族英勇战斗的《义勇军进行曲》定为国歌呢？为什么还要时时唱起“中华民族到了最危险的时候”呢？用一个成语来表达是(   )