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We still have a lot to learn about life under the sea. Do you know that (1) ( much, more, many ) people go into space than visit the bottom of our biggest seas! The biggest animals (2) ( where, what, that ) live in the sea are whales. Blue whales are (3) ( the, a, an ) biggest kind and they are much bigger than any dinosaurs that ever lived ! A lot of the fish we eat comes (4) ( under, to, from ) the sea. Fishing in the sea is (5) ( both, all, any ) a job and a hobby in countries all over the world. When people think of the most dangerous fish in the sea, they (6) ( never, usually, once ) think of sharks. Most people are afraid of sharks (7) ( than, because, so ) of stories in books and films. (8) ( There, These, They ) are more than 350 different kinds of sharks but only a few are dangerous to man. Dolphins also (9) ( lives, living, live ) in the sea and most people love to see them. Dolphins (10) ( have, see, are ) very friendly and clever and often enjoy swimming with people.