1 . To achieve harmony between humans and animals, the world must protect these beautiful _____ (creature). (所给词的适当形式填空)

2 . Many of these bags end up in the ocean where larger ones can trap sea________(create), such as turtles and dolphins. （所给词的适当形式填空）

3 . Blue whales are the largest ________ (create) ever to have lived. (所给词的适当形式填空)

4 . Many kinds of fish and___________have reappeared after fishermen moved ashore(到陆地上) and stopped fishing.(creat) （所给词的适当形式填空）