There is a line of peach trees on each side of the straight

There is a line of peach trees on each side of the straight there are trees on each side of the river On each side of the street ( ) a lot of trees. There are many trees on( )side of the street( A ever B each Look!On the each side of the street are a lot of trees.为什么在句 There are trees on ___ side of the road.这个空可以填each吗? There are trees on each （either) side of the street 选择哪一个 there are many trees on each/every side of the lake说明选择原因 There are trees on either side of the road.此句中either可以换成each on each side of the street(grow)a lot of trees 为什么是grow不是are on each side of the street(grow)a lot of trees On each side of the street__ a lot of trees为何不能用are grown