Today, my brother and sister and Lei Ting played a very interesting game, I finished my homework later went to Leilei, Lei brother gave me and miss TingGave a title: what cannot be seen but eat?My sister and I think for a long time, Miss Ting said: "I guess it is gas!"But Lei brother shook his head,"I want to be the air!"Lei brother nodded.Miss Ting said: "should now play the game?""How do you know that game?"I am goodStrange question.Lei brother said: "well, we play by brick!