【if you can't sleep well ,try---some milk before you going t

【if you can't sleep well ,try___some milk before you going to bed.】
1】
the result of the exam was not made_____until last week.
这里为什么用known 不用to know呢?
make被动式不是要+to么?
2】
if you can't sleep well ,try___some milk before you going to bed.
为什么用drinking不用to drink,还有为什么是before you going to bed不是befoer you go to bed?
3】
she looked___at the news and looked ___at the picture of her ded son
第一个是sad,第二个是sadly,为啥啊?
会多少答多少吧,会加分的