1 There're two brothers.One lives on one side(边),and the other is on the other side.
（ears,耳朵）
3.It lives in a case.When you want to write something,it can help you.
（pen,钢笔）
4.It walks all the time,but never(从不) leaves its place.
（clock,钟）
5.It can swim in the water.And it has got a tail(尾巴) and fins(鳍).
（fish,鱼）
2.It is black when it's clean and white when it isn't clean.
（blackboard,黑板）
1 When people say something,they can hear.But they can' t see each other(互相).
（ear,耳朵）