根据短文内容，用方框中所给的单词的正确形式填空，使短文通顺、完整。
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A 12-year-old boy got lost on the subway after going out alone on Sunday. The boy came to Shanghai to visit his parents during the summer holiday. Although his parents were happy to see him, they ____ little time with him. The boy did his homework for two ____ and felt bored, so he went out to play on the subway. He had fun playing there. But when he felt tired and hungry, and wanted to go home, he didn't know at which station he should get off. The police found the boy ____ on the subway and took him to the office. They bought him something to eat and asked him some questions. The boy's parents couldn't find him after arriving home. They felt ____ and called the police right away. They got to the police office and saw ____ son. They were very happy and thanked the police.
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