脑筋急转弯

1.How many feet are there in a yard?2.What month do soldiers hate?3.Why did the boy take a ladder to school?4.What goes uphill and downhill, and always stain the same place?5.What has a neck but no throat?6.We are four brothers under one roof. Do youknow us?7.How many sides does a pail( 桶)have?8.From what number can you take half and leanothing?9.Why do birds fly south for the winter?10.What doesn't move its position when it iswalking?11 .What is the end of everything?