如图，直线a和直线b被直线c所截，给出下列条件：
①∠1＝∠2；②∠3＝∠6；③∠4+∠7＝180°；④∠5+∠8＝180°．其中能判断a∥b的条件是____．

若关于x，y的二元一次方程组的解满足x+y>1，则k的取值范围是____．

如图，直线l∥m，将含有45°角的三角形板ABC的直角顶点C放在直线m上，若∠1＝25°，则∠2的度数为____．

若y=+3，则x^y=____．

小强推着小车，30s内在水平地面上匀速前进了15m，则小车的速度为____m/s。如果水平推力为10N，在此过程中小强对小车做的功为____J，功率为____W。

—How amazing the Great Wall is!—Yes, but it is very ____ to climb it.(tire)

“We must keep ____ in the library,”the librarian said to me____. (quiet)

—The accident was really terrible,wasn’t it?—Yes,it was.The young man on the bicycle was too ____.(care)

老师有重要的事情要告诉我们。The teacher has ____ to tell us.

如图，直线y=kx+b经过A(-3，0)和B(2，m)两点，则不等式组2x+m-4<kx+b≤0的解集为 ____．