英语，谢谢啦！
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参考答案如下：
1. Are ... cleaning, they are
2. is swimming
3. isn't watching
4. walks
5. His music teacher is singing an English song.
助你愉快学习！
1. Are ... cleaning, they are
2. is swimming
3. isn't watching
4. walks
5. His music teacher is singing an English song.
助你愉快学习！
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