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: When the clock has no angle I will own yesterday, tomorrow and tonight What m I?

Question: what do you call a pair of pairs?

Question: A horse jumps over a castle and lands on a man, then the man disappears. How was this possible?

Question: An old man wanted to leave all of his money to one of his three sons, but he didn't know which one he should give it to. He gave each of them a few coins and told them to buy something that would be able to fill their living room. The first man bought straws, but there was not enough to fill the room. The second bought some sticks, but they still did not fill the room. The third man bought two things that filled the room, so he obtained his father's fortune. What were the two things that the man bought?