Last term,Peter was ____ at home.His parents were doing busines in another city. He felt lonely,so he often turned on the computer and played computer ____. However, sitting in front of the computer for a long time is ____ for him. And he spent little time on his study.He failed his exams.Luckily,his parents ____ his problem in time.They decided to come back home.Peter studies hard now.So far,he has made progress in his study.He ____ he can catch up with his classmates soon.

下图为J－15舰载机从我国首艘航母“辽宁号”上起飞的情景。以下说法正确的是（   ）

①树立以人为本思想，为公民谋福利

②坚持依法执政，公正司法

③全面行使其职能，坚持依法行政

④自觉接受人民监督，坚持廉洁奉公

函数y=x²+bx+c与y=x的图像如图所示，有以下结论：

①b²﹣4c＞0；②3b+c+6=0；③当1＜x＜3时，x²+（b﹣1）x+c＜0；

④ $\sqrt{b^2+c^2}=3\sqrt{2}$ ，其中正确的有____