How many words can a pen with half refill write?

Can you write down eight eights so that they add up to one thousand?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

I look at you, you look at me, I raise my right, you raise your left. What am I?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business.

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

What has one letter and starts with an E?