脑筋急转弯What is it that you can keep after gving it to someone else?

脑筋急转弯What is it that you can keep after gving it to someone else? What is it that we never borrow but often return?脑筋急转弯 脑筋急转弯：What letter is an animal 脑筋急转弯:what is full when it's used and empty when it's at rest the more there is,the less you see what is it英语的脑筋急转弯 What is most useful when it is used up?高分求脑筋急转弯,用英语回答 请问一道英语脑筋急转弯Today is our country's birthday .What date is it? 脑筋急转弯：What question is that to which you must alaways answeryes? What is that we never borrow but often return?有点脑筋急转弯的性质 英语脑筋急转弯 What belongs only to you,but is used more by others than yourself.What is it? 脑筋急转弯 ：one person can do it ,but two cant do it together ,what is it 脑筋急转弯when one doesn't know what is it,then it is something;but when one knows what is it ,then it is nothing (不好意思啊） 一道脑筋急转弯,汉语回答,A huge animal which is white and lives in north pole .What is it? 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