1,You walk,it walks,too.You stop,it stop,too.It's not on the ground.It's in the sty.What is it?
2.There is a small picture.With many teeth on its sides.It is a friend of a letter.With it,a letter goes all over the world,What is it
3.It has four leg,but it can only stand.It can' t walk.What is it?
4.What is the easiest invention today?