There was much fog this morning.()

There was much fog this morning.()
It ________________ this morning.
They didn't arrive on time because it snowed heavily.()
___________________________________________.
对于整数a,b,c,d,符号|a b|表示运算ac-bd,已知1＜|1 b|＜3,则b+d的值是：
|c d| |d 4|
已知关于x的不等式2x+m＞-5的解集如图所示,则m的值为（ ）.
第二题改简单句