1. (2018七下·福田期末) 用所给单词的适当形式填空，未提供单词的限填一词

    Last month, Jack went to swim in the sea. He swam really far, past the rocks and out to sea. He enjoyed  (he)swimming in the blue sea.

    Then he saw something (move) towards him. It was huge and gray, a large fin. It was a shark! shark started to swim around him. Jack began to swim back, the beach was too far away.

    Jack was really scared. Suddenly another creature appeared next to him in the water. It was a dolphin! It pushed him away from the shark. Jack sat its back as it swam towards the beach.

    Soon they were near the beach. The shark did not follow them. As soon as Jack  (step) onto the beach, the dolphin swam away. He will always remember how this  (friend) animal saved his life.

    This is not just a story. In fact, dolphins do save people's (life)like that. There are also many dangerous things in the sea, so take (careful)when you go swimming.