①获得国家赔偿权是公民的基本权利    ②追求正义完全靠司法机关公正司法

③最高人民法院是最高法律监督机关    ④法律是公民合法权益的“保护伞”

根据上下文理解，选择所给词的适当形式填空。

   Yesterday was Sunday. We had no____ . I wrote a letter to my pen pal and____ lunch for my parents. After lunch I took a ____with Mike through the park behind my house. We saw a little girl____ for something. She lost her keys. “She ____  help,” Mike said. So we helped the girl look for her____ . About ten____  later, Mike found them in the grass. The girl was ____ . We spent much time in looking for the____ keys, but we____  very happy because we did a good deed（做好事）.

若y=$\sqrt{x-1}$+$\sqrt{1-x}$﹣2，则﹣xy的值为（　　）