脑筋急转弯 quick thinking 1. What will you break once you say it? (什么东西一说出来就打破？) 　　 2. What always goes up and never goes down? (什么东西只升不降？) 　　 3.What animal can jump as high as a tree? 4.What must you do before you return a book to the library? 5.A police officer had a brother ,but the brother had no brother.How could that be? 6.Which month has 28 days? 7.What starts with T ， ends with T， and can be full of T ？ 8.what room has no walls, no doors, no windows and no one to live in? 9.Where does afternoon always come before morning? 10.what kind of dog never bite?