Bill is in the lake,and the water is only up to his ankles,but he is in danger,why?

Bill is in the lake,and the water is only up to his ankles,but he is in danger,why? Is there water in the lake Bill is in the classroom,doing( )homework The water in the lake is clean一般疑问句 There is an island in the m______ of the lake. which is the deepest salt lake in the world? There is a boat in the m_______of the lake Dongting Lake is the ____(one) largest fresh water lake in China. Is there a lake in the nature park?该否定 Lily is swimming in the lake（改错）发错啦（Sorry~ a there duck is the lake in连词成句 Bill Gates is the richest man in the world Bill Gates is the richest man in the world是什么意思 The waiter's tip is included in the bill. The Summer Palace is very beautifu.There is Kunming Lake in it.(合并)The Summer Palace _______very beautiful ________Kunming Lake. What is the name of the Lake in northern Utah of the U.S.A.A) Lake Michigan.B) Lake Superior.C) Lake Erie.D) the Great Salt Lake. the prediction about maximum profits is still in lake of solid ground,请问这里的in lake of solid So ______ that no fish can live in it.(上海1992)A.the lake is shallow B.shallow the lake isC.shallow is the lake D.is the lake shallow