9．Where do animals speak with each other？
10．When will a net hold water？
11．When can we see things without our eyes open？
12．What has a lot of teeth but no mouth？
13．What goes up but never comes down？
14．What tree is of the greatest importance in history？
15．Why is a madman like two men？
Key： 1．Newspaper．2．Vegetable．3．Road． 4．Stationary（Stationery）．5．Because they are always longer in bed than others．6．Take away“y”（lady—lad）．7．Fox—Ox．8．Dictionary．9．In the fairy tales and fables．10．When the water turns to ice．11．When we are dreaming．12．Comb．13．Your age．14．Date． 15．Because he is a man beside himself．