Good Riddles

Question: I can be curved or straight And have many legs But with four letters less I am exactly the same What am I?(5 letters)

Question: You use me. I keep you neat. Every once in a while you empty me out. What am i?

Question: Tommy is in a cave. He stops to find two tunnels. There is a guard before each tunnel. Tommy knows two things: 1. One tunnel leads to the fields of punishment and the other fields of rewards 2. One guard always lies and the other always tells the truth. Tommy can only ask one yes or no question to either one of the guards. The tunnels and guards look exactly the same. What question can Tommy ask to get to the fields of rewards and not death?

Question: IF I WILL TAKE OUT ITS FIRST THIRD AND LAST LETTER STILL IT WILL SOUND THE SAME

Question: A thing which is Live ,as we use it Everyday for watching this Beautiful Nature,and has high auto-focusing strength!!! so what is it??