The children are swimming( ) the river.(填介词）

where are the children? Why are the children There are many rules for water safely.These rules can help save not only your life- 1 - the life of a friend.First of all,know 2 .Many schools 3 swimming lessons to children.Adults can learn to swim at public pools .4 rule to remember is never to swi The children are playing games. the children is 还是are Children are what the mothers are. “children are what the mathers are The children are wearing beautiful clothes.　　The children are_________beautiful clothes. The children are water the trees. The children are water the trees对吗? The children are _______ at the beach. hou nice children they are!的children前要加the吗 These are the（ ）（ children ）books. what are the children doing是什么意思啊好急呀 The children are working hard.改为感叹句. The children are very happy改为感叹句 where the ether children are的意思 where the ether children are快