脑筋急转弯:what is full when it's used and empty when it's at rest

脑筋急转弯:what is full when it's used and empty when it's at rest 脑筋急转弯：What letter is an animal 英语脑筋急转弯：What starts with T,ends with T,and can be full of 脑筋急转弯 What starts with T,ends with T,and can be full of T 脑筋急转弯:what starts with T ends with T and can be full of T 英语脑筋急转弯what is in the middle of water What is the difference between here and there?脑筋急转弯 英语脑筋急转弯what is in the middle of water 脑筋急转弯:what is in the middle of paris? 脑筋急转弯What part of London is in France what is in middle of the world?英语脑筋急转弯 what tree is always very said?脑筋急转弯 What is always coming but never arrives?(脑筋急转弯） What is in the middle of the USA?(脑筋急转弯) 脑筋急转弯What is the smallest room in the world? 脑筋急转弯What season is the most dangerous one? what is always coming,but neveer arrives?脑筋急转弯 What letter is a question?是什么?这是脑筋急转弯