阅读下面短文，在空白处填入一个适当的单词或括号内单词的正确形式。

Sea lions are kind to people. They are (love) and friendly animals. We can often see them on the (beach) all around the world. It can be quite dark in the ocean, but sea lions can find their way (easy). Sea lions are good divers. They can dive 45 feet or even deeper. But they dive too deep, maybe they will die. Sea lions are great (swim), too. They can swim at a speed of 40 kilometres each hour. This helps them get away sharks. Every year，people kill (thousand) of sea lions for their skin. That's sea lions are becoming fewer and fewer. To keep this kind of animals alive forever, we should (stop) people from killing them. Or our grandchildren will have no chance to see sea lions in many (year).