Good Riddles

Question: what is a cow moving backward?

Question: What flag has five circles in it?

Question: There are 4 tea cup (you must say 4 tea cups as in 40 cups) 3 fall down and smash how many are left

Question: how do cows count?

Question: in all of written history I won't show up at the end of a sentence but I will be there in the end . . .