I run in and out of town all day and night. What am I?

What word can before base, down and screen?

Latest riddles:

Riddle: I am blue, yet I see the color green. Green sees me, but I'm not really blue. What am I?

I am blue, yet I see the color green. Green sees me, but I’m not really blue. What am I?

Riddle: You'll find me below, though I ain't dead. Open your mouth, I'll keep you fed. Mighty is my crown, thin is my body. Children must take me, else their vision will be shoddy. What am I?

You’ll find me below, though I ain’t dead. Open your mouth, I’ll keep you fed. Mighty is my crown, thin is my body. Children must take me, else their vision will be shoddy. What am I?

Riddle: I seal the promise of your vow, I start conversations that end in ciao. I grow with nature with the tallest of trees, a punching sport requires me. What am I?

I seal the promise of your vow, I start conversations that end in ciao. I grow with nature with the tallest of trees, a punching sport requires me. What am I?

Riddle: What question can someone ask all day long, always get completely different answers, and yet all the answers could be correct?

What question can someone ask all day long, always get completely different answers, and yet all the answers could be correct?

Riddle: I leap without wings, I sing without a choir. I start out in water, then hop where it's drier. I can sleep through the winter under the mud, And I'm famous for snatching a fly with a thud. What am I?

I leap without wings, I sing without a choir. I start out in water, then hop where it’s drier. I can sleep through the winter under the mud, And I’m famous for snatching a fly with a thud. What am I?

Riddle: I run all around the pasture but never move. What am I?

I run all around the pasture but never move. What am I?