填空题

Fish are animals that live in water. They live in almost any place (11) there is water. Some are found in lakes, other fish live in the sea. Most fish never (12) water. There are about 21,000 kinds of fish. One kind might not look like another. Some fish are very small. The smallest one is no bigger than a fly. Others are very big. The biggest fish can (13) to 60 feet. One kind of fish looks (14) it has a little horse’s head. It is called a sea horse. It doesn’t swim very well. A sea horse is mostly pushed along by the (15) water. What does it do when it wants to stay in one place It takes hold of plants with its little tail.