题目

完形填空He lost his arms in an accident. Since then，he has had to depend on his  1  brother. In order to  2  him，his younger brother became his shadow (影子)，never leaving him  3  for years. Except for writing with his  4  ，he was completely unable to do anything in his life.As the two brothers  5 together，then one day，his younger brother had to work far from him，living his own life，as many normal people do. So he was heart-broken and didn’t know  6 to do.A similar misfortune（不幸） happened to a girl，  7 .One night her mother disappeared after arguing若x2-3+3-x2+2=y，试求xy的值．