Cách làm cho bạn:
Sam used colorful shorts to make a SOS emergency signal. In Friday morning, Sam heard a helicopter flying over. He shouted and waved his arm but they didn't see him. In the afternoon, another helicopter flew over the SOS signal. The wind from helicopter's engine blew up Sam's shorts and the pilot suddenly spotted them. The pilot searched the area again and found Sam five kilometres far from cattle farm.
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