1. There"e two brothers. One lives on one side(边), and the other is on the other side. ______ When people say something, they can hear. But they can" t see each other(互相). 2. It is black when it"s clean and white when it isn"t clean. ______ 3. It lives in a case. When you want to write something, it can help you. ______ 4. It walks all the time, but never(从不) leaves its place. ______ 5. It can swim in the water. And it has got a tail(尾巴) and fins(鳍). ______ |