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【答案】1. The boy is very happy because he eats a chocolate.(仅供参考) 2. The boy is very happy because he has a good time at the party. (仅供参考) 3. The boy runs because he is late for school. (仅供参考) 4. The boy runs because he likes running. (仅供参考) 5. The boy runs because a dog is after him. (仅供参考)
【解析】
略