急求英语，谢谢，，
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2. A teacher is having lessons in the classroom.
3. Some students are studying in the library.
4. There are some boys running towards the playground.
5. A man is singing in the concert hall.
3. Some students are studying in the library.
4. There are some boys running towards the playground.
5. A man is singing in the concert hall.
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有帮助的话请采纳哦，谢谢！：）
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