one day, during the long summer hol

one day, during the long summer holiday, Mrs. Martins took Brendon and his younger brother and sister to the beach. As soon as they got there, the three children raced down to the sea to try out their new surfboards. They were soon swimming out to the waves and riding back on their boards.After a while, Brendon noticed that Kim was floating away from him and his sister. “Come back, Kim,” he shouted. “Mum said we have to stick together.” Kim put his arms over the side of his board and began paddling（划水）, but instead of getting closer, he began moving further away.“Brendon, help! ” called Kim. “I’m caught in a rip（离岸流）.” Brendon quickly paddled over to his brother.“Hold on to the back of my board and I’ll pull you in, ” Brendon told the frightened boy. But the rip was too strong and soon both Brendon and Kim were moving further from the beach.“Kylie, come and help, ” Brendon yelled to his sister. Soon all three children were floating away from the beach.“It’s no use fighting,” said Kylie, “We’ll just tire ourselves out. We have to stick together and hope the current takes us onto the beach again.” For the next 20 minutes, the frightened children held onto each other’s boards and let the current pull them along.