trees reflected in the water 与clouds reflecting on the lake

trees reflected in the water 与clouds reflecting on the lake in the lake 与 on the lake 什么差别? in the lake和on the lake Is there water in the lake Lucy-------(water) the trees on Sundays the water lilies floated on the surface of the lake in the sea 和on the lake in winter,the water in the lake sets ( ) 5 meters on the lake与by the lake有何不同? The water in the lake is clean一般疑问句 谁知道：How can the water in the lake become vapour? the students plant trees ___ the lake