题目内容：
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 11O bigger than a fly．Others are very big．The biggest fish can 13 to 60feet．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．__________.
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