Riddles

I am white when I am dirty and I am black when I am clean. What am I ??

The more you take the more you leave behind. What am I ??

What is easy to get but hard to get out of ?

You use a knife to slice my head and cry when i am dead ?

Name three consecutive days without using Sunday, Wednesday and Friday.

We see once in a year twice in a week and never in a day. What it is ?

What do we add to this so that it makes it 6

lX

We buy it for eating but we don't eat it. What is it ?

What normally lose head in the morning but get it again at night

I don't have eyes, ears, nose and tongue but I can see, hear, smell and taste everything. What am I ?