中国第五直辖市:脑筋急转弯 Why is an empty matchbox the best thing to have in the world ?(

脑筋急转弯 Why is an empty matchbox the best thing to have in the world ?( 脑筋急转弯：What letter is an animal ? 脑筋急转弯:1.Why is the letter "T" like an island? 2.Why is the letter "A" like a flower? 脑筋急转弯why cannot the world come to an end? 脑筋急转弯: Why is U the jolliest letter? 脑筋急转弯：Why is the letter E so important? 脑筋急转弯 Why is the pig always eating? 脑筋急转弯:Why is the letter E so important? 脑筋急转弯 Why do birds fly south? 脑筋急转弯 Why does time fly?