Logic riddles with simple answers

You bury me when I am alive, and dig me up when I die. What am I?

It regulates our daily movements, but it feels no interest in our lives. It directs us when to come and go, but does not care if we pay attention. What is it?

What has many keys but can't open any doors?

It is an insect, and the first part of its name is the name of another insect. What is it?

A seven letter word containing thousands of letters.

What has only two words, but thousands of letters?

Think of a number. Double it. Add ten. Half it. Take away the number you started with. What is your number?

It's 7:00 am. You are asleep and there is a sudden knock on the door. Behind the door are your parents, who came to have breakfast. In your fridge: bread, pasteurised milk, juice, and a jar of jam. What will you open first?

What is red but it smells like a blue paint?

It always becomes white when it becomes dirty. What is that?