river
                    - The Yangzhi River is one of __________ in the world.
 - When I passed the river, I saw some children ______ on the sand.
 - You ____ swim in the river here. It’s dangerous.
 - The water in the river nearby will be dirtier than before if nothing __________.
 - The river smells so terrible! How did it come about?—People used to pour dirty water into it.
 - My flat is near the river. I often stand in the balcony and______ the ships in the river.
 - The river is very long and it is about.
 - The river through our city is about__________.
 - The river is very long and it is about.
 - The river through our city is about__________.