what in the world could have become of him什么意思啊谢了

what in the world. what is the biggest in the world what in the world are you eating! What in the world is that? What's the fastest bird in the world?What's the fastest animal in the world? 动脑筋（what goes around the world.)what goes around the world and stays in a corner? 动脑筋（what goes around the world -----)what goes around the world and stays in a corner? What river is the longest in the world? What's the buggest animal in the world what is the most sleepy animal in the world? What stands in the middle of the world世界? what stands in the Middle of the world 猜谜语 What stand in the middle of the world?谜语 What stand in the middle of theworld?It's____. 脑筋急转弯What is the smallest room in the world? what is the longest word in the world What`s the biggest lake in the world What are the bigbest animals in the world?