In the text below some words are missing. Select appropriate words to fill the gaps.

Dolphins are (1) ………………. mammals found all over the world. There are many different species. They are well-known as intelligent (2) …………………… and seem to communicate with one another in (3) ……………………. ways. Dolphins are sociable animals in that they live in groups. These can range in size from five to several hundred. They often (4) ………………… in groups and work together to capture the fish or squid they like to eat.

(1) strange (2) hunt  (3) creatures (4) different (5) marine (6) learn (7)sophisticated

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